IK Multimedia iRig Pro Duo I/O: Detailed Review
- 2-channel audio/MIDI interface for mobile devices and computers
- Combo XLR/TRS inputs for microphones, line-level devices, and instruments
- 24-bit/96kHz resolution for high-quality audio
- MIDI in/out for connecting keyboards, controllers, and other MIDI devices
- Phantom power for condenser microphones
- Direct monitoring switch for zero-latency monitoring
- Multicolor LED indicators for input level and audio status
- Powered by USB, 2xAA batteries, or optional power supply
- Comes with a suite of software and apps for music production
- Compact and portable design for easy transport
Specifications, Advantages, and Disadvantages
The IK Multimedia iRig Pro Duo I/O is a versatile 2-channel audio and MIDI interface designed for mobile devices and computers. This compact and portable interface allows musicians, podcasters, and content creators to easily connect their instruments, microphones, and MIDI gear to their iOS and Android devices, as well as Mac and PC computers. It features two combo input jacks that accommodate both XLR and 1/4" connectors, providing high-quality preamps with phantom power for condenser microphones.
The iRig Pro Duo I/O offers 24-bit/96kHz audio quality, ensuring professional-grade sound recording and playback. It includes MIDI input and output jacks for seamless integration with MIDI controllers and other MIDI-compatible gear. The unit is bus-powered via USB when connected to a computer, but can also run on two AA batteries or an optional power supply when used with mobile devices, making it ideal for on-the-go recording sessions.
With its robust build, intuitive controls, and comprehensive compatibility, the iRig Pro Duo I/O provides a reliable and flexible solution for capturing high-quality audio and MIDI performances anywhere. Its user-friendly design and broad feature set make it an essential tool for any modern audio professional.
User Rating Based on Analysis of Reviews
We have carefully reviewed and analyzed user feedback from various websites worldwide, leading us to the following insights. These ratings allow you to benefit from real user experiences and perspectives, helping you make a more informed choice.
Purchase Value
85% of users were satisfied with the purchase value of the iRig Pro Duo I/O, noting that it offers a comprehensive suite of features for the price point. Many appreciated its dual-channel capability and flexibility for both mobile devices and computers, making it a cost-effective solution for musicians and producers looking for a portable interface without compromising on quality.
15% of users expressed dissatisfaction with the purchase value, indicating that they found the price a bit high compared to other interfaces with similar features. Some also mentioned that additional accessories, which could enhance the overall experience, were not included in the package, potentially increasing the overall cost.
Quality of Materials
80% of users were pleased with the quality of materials used in the iRig Pro Duo I/O. They commented positively on the robust build and durable components, which contributed to a reliable user experience. Users highlighted that the physical controls and connectors felt sturdy, adding confidence to the interface's longevity.
20% of users were dissatisfied with the quality of materials, reporting issues such as flimsy knobs and a plastic casing that felt less premium. Some users experienced wear and tear sooner than expected, which raised concerns about the interface's durability over time.
Ease of Use
90% of users found the iRig Pro Duo I/O easy to use, with a straightforward setup process and intuitive controls. They appreciated the plug-and-play functionality, especially when switching between mobile devices and computers, and noted the convenience of having a compact interface that doesn't require extensive configuration.
10% of users felt the interface was not as user-friendly as anticipated. Some encountered difficulties with initial setup or with understanding the manual, which they found lacking in clarity. A few users also mentioned compatibility issues with certain devices, which added to their frustration.
Sound Quality
88% of users were satisfied with the sound quality provided by the iRig Pro Duo I/O. They praised the clear and clean audio output, noting that the interface effectively captured the nuances of their instruments and vocals. The high-quality preamps were frequently highlighted as a major advantage, especially for professional recordings.
12% of users were not satisfied with the sound quality, mentioning issues such as noise interference and a lack of depth in the audio output. Some users experienced latency problems, which affected their recording sessions and overall satisfaction with the product.
Portability
92% of users were highly satisfied with the portability of the iRig Pro Duo I/O, commending its compact and lightweight design. They found it convenient to carry for on-the-go recordings and appreciated its ability to seamlessly integrate with various devices, making it an ideal choice for traveling musicians or producers.
8% of users were less satisfied with the portability, mentioning that while the device itself is compact, the need for extra cables and power supplies could reduce its overall convenience. A few users also noted that the lack of a protective case made transportation risky.
Compatibility
87% of users were pleased with the compatibility of the iRig Pro Duo I/O with a wide range of devices and operating systems. They appreciated the seamless integration with both iOS and Android devices, as well as with Windows and macOS computers, allowing for a versatile user experience.
13% of users faced compatibility issues, particularly with less common software or older operating systems. Some users reported needing additional drivers or experiencing glitches when connecting to certain devices, which hindered their overall experience.
Feature Set
86% of users were satisfied with the feature set of the iRig Pro Duo I/O, highlighting the dual-channel functionality, MIDI capabilities, and phantom power support as standout features. Users found these features enabled a comprehensive audio production setup in a portable form factor.
14% of users felt that the feature set was lacking in some areas, such as the absence of more advanced control options or limited onboard effects. A few users also desired more input/output ports for greater flexibility in complex setups.
Customer Support
82% of users were satisfied with the customer support provided by IK Multimedia, noting responsive and helpful service. Many appreciated the quick resolution of issues and the availability of detailed online resources, which aided in troubleshooting and maximizing the product's capabilities.
18% of users were dissatisfied with customer support, citing slow response times or unhelpful interactions. Some users felt that their queries were not adequately addressed, and a lack of detailed guidance or follow-up contributed to their frustration.
Durability
79% of users were satisfied with the durability of the iRig Pro Duo I/O, reporting that it withstood regular use without significant wear. Many users found it reliable over time, attributing this to the solid construction and quality components.
21% of users were dissatisfied with the durability, mentioning issues such as broken connectors or malfunctioning controls after a few months of use. Some users felt that the materials used did not match the expected durability for a device in this price range.
Design
88% of users were satisfied with the design of the iRig Pro Duo I/O, praising its sleek and modern aesthetics. They appreciated the compact layout that maximized functionality without complicating the user experience, making it an attractive addition to their audio setup.
12% of users found the design lacking, with some noting that the layout could be more intuitive. A few users mentioned that certain controls were awkwardly placed, which occasionally made adjustments during recording sessions cumbersome.
Latency
81% of users were satisfied with the low latency performance of the iRig Pro Duo I/O, highlighting its effectiveness in delivering real-time audio monitoring and minimal delay during recording sessions. This was particularly appreciated by those using it for live performances or critical recording tasks.
19% of users experienced latency issues, which disrupted their recording processes. Some users noted that the latency was noticeable when using specific software or devices, which required additional adjustments or workarounds to manage effectively.
Setup Process
89% of users found the setup process of the iRig Pro Duo I/O to be straightforward and user-friendly. The clear instructions and minimal components required for installation were appreciated, allowing users to start recording quickly and with minimal hassle.
11% of users encountered difficulties during the setup process, often due to unclear instructions or missing components. Some users had trouble with initial device recognition or configuration, which delayed their ability to use the interface effectively.
Battery Life
77% of users were content with the battery life of the iRig Pro Duo I/O, noting that it performed well for extended recording sessions without needing frequent recharging. This was particularly valued by users who needed a reliable interface for location recording.
23% of users were dissatisfied with the battery life, finding it insufficient for longer sessions or extensive fieldwork. Some users reported that the battery drained faster than expected, requiring them to carry additional power solutions to ensure uninterrupted operation.
Versatility
91% of users appreciated the versatility of the iRig Pro Duo I/O, with its ability to handle various recording scenarios and compatibility with multiple devices and software. Users valued the flexibility it offered in both studio and mobile environments, catering to a wide range of creative needs.
9% of users found the interface less versatile than anticipated, primarily due to limitations in certain features or connectivity options. Some users experienced difficulty adapting the interface to specific niche requirements or setups.
Software Integration
84% of users were satisfied with how well the iRig Pro Duo I/O integrated with their preferred software, highlighting seamless connectivity and stable performance during use with popular DAWs. The included software bundle was also noted as a valuable addition.
16% of users faced integration challenges, particularly with less common software applications. Some reported issues with driver compatibility or unexpected software conflicts that required additional troubleshooting to resolve.
Value Added Features
83% of users appreciated the value added features of the iRig Pro Duo I/O, such as the included software package and MIDI functionality, which enhanced the overall user experience. These features were seen as beneficial for expanding creative possibilities.
17% of users were disappointed with the value added features, feeling they fell short of expectations. Some users found the bundled software to be limited or not fully compatible with their existing workflows, diminishing the perceived value of these additions.
Technical Support
80% of users were satisfied with the technical support provided, finding it effective in resolving issues and offering guidance on product features. Many users appreciated the accessibility of support through multiple channels, including online forums and direct contact.
20% of users were dissatisfied with technical support, citing unresponsiveness or inadequate solutions to their problems. Some users felt that more complex technical inquiries were not handled efficiently, leading to prolonged resolution times.
Input/Output Options
86% of users were pleased with the input/output options available on the iRig Pro Duo I/O, noting the balanced inputs and MIDI connectivity as key strengths. These options allowed users to connect a wide range of instruments and gear, providing flexibility for various recording setups.
14% of users found the input/output options limited, wishing for additional ports or more advanced connectivity features. Some users mentioned that the existing options were insufficient for larger or more complex setups, which restricted their recording capabilities.
Aesthetic Appeal
89% of users appreciated the aesthetic appeal of the iRig Pro Duo I/O, complimenting its sleek design and professional look. The interface was often described as visually appealing and a good fit for both home and professional studios.
11% of users were less impressed with the aesthetic, feeling that the design was too basic or not distinctive enough. A few users also noted that the finish could be prone to scratches or fingerprints, affecting its appearance over time.
Power Options
78% of users were satisfied with the power options provided by the iRig Pro Duo I/O, valuing the ability to operate on both battery and external power sources. This flexibility was appreciated for enabling use in various recording situations without dependency on a single power type.
22% of users were dissatisfied with the power options, expressing concerns about the interface's power consumption or the need for frequent battery replacements. Some users found the external power adapter cumbersome or not included, which added inconvenience.
In the rest of this article, we will thoroughly examine the specifications, advantages, and disadvantages of the IK Multimedia iRig Pro Duo I/O 2-Channel Audio/MIDI Interface. Our comprehensive review aims to provide you with all the details you need to make an informed decision about this versatile audio interface for both mobile devices and computers.
Pros:
- Portable and compact design, making it easy to carry for mobile recording.
- Compatible with a wide range of devices including iOS, Android, Mac, and PC.
- Provides high-quality audio recording with 24-bit/96kHz conversion.
- Includes both MIDI input and output for added versatility.
- Powered by USB, AA batteries, or a power supply, offering flexible power options.
Cons:
- Relatively higher price point compared to other portable interfaces.
- Plastic build may feel less durable than metal alternatives.
- Some users report occasional connectivity issues with certain devices.
- Limited to two channels, which may not be sufficient for more complex recording setups.
- Battery life can be short when using AA batteries.
General
| Display | 4x Color LED |
|---|---|
| Channels of I/O | 2 Input / 2 Output at 44.1/48 kHz |
| Number of Analog Outputs | 2 |
| Number of Microphone Inputs | 2 |
| Built-In Microphone | |
| Input Level Adjustment | 2x Knob |
The specifications of the IK Multimedia iRig Pro Duo I/O highlight its versatility and functionality as a mobile audio/MIDI interface. Show More
Starting with the Display, the interface features a 4x Color LED system that provides users with visual feedback on levels and status. This allows for easy monitoring of input and output signals, ensuring that you can quickly assess whether your audio is being captured at the correct levels and if the unit is functioning properly.
The Channels of I/O specification indicates that the device supports 2 input and 2 output channels at sample rates of 44.1 kHz and 48 kHz. This means you can record two audio sources simultaneously—ideal for a variety of applications, such as music production or podcasting—while also being able to output two separate audio signals for monitoring or playback.
In terms of Number of Analog Outputs, the iRig Pro Duo I/O includes 2 dedicated outputs. This allows for a more flexible routing of audio signals, enabling you to send your audio to different destinations, whether it’s speakers, a mixer, or recording equipment.
The Number of Microphone Inputs is also 2, which means users can connect two microphones directly to the interface. This is particularly beneficial for recording duets or interviews, allowing for high-quality audio capture from multiple sources at once.
However, it is important to note that the device does not come with a Built-In Microphone, meaning users will need to supply their own microphones for recording. This allows for greater flexibility in choosing the type of microphone that best suits their needs, whether it be a dynamic or condenser microphone.
The Input Level Adjustment feature is managed through 2 knobs, which provide users with the ability to fine-tune the input levels of their microphones or instruments. This ensures that audio levels can be optimized for clarity and avoids distortion, resulting in higher quality recordings.
Overall, these specifications illustrate the iRig Pro Duo I/O as a highly functional and portable solution for musicians and audio professionals looking to capture high-quality audio on the go.
Signal Processing
| Pad | |
|---|---|
| Gain/Trim Range | XLR Mic: +50 dB 1/4" Line Inputs: 27 dB |
| High-Pass Filter |
The iRig Pro Duo I/O features several important specifications that enhance its functionality for audio recording and processing. Show More
The absence of a pad feature means that the device does not have a built-in attenuation option for incoming signals. This can be critical when dealing with particularly loud sound sources, as a pad would help prevent distortion by reducing the signal level before it reaches the interface. Users should be mindful of their input levels to avoid clipping.
The Gain/Trim Range is a key aspect of the interface's versatility. With a gain setting of +50 dB for XLR mic inputs, it allows for capturing quiet sources such as vocals or acoustic instruments with clarity. Meanwhile, the 1/4" line inputs provide a gain of 27 dB, suitable for connecting instruments or other line-level devices. This range helps users achieve optimal recording levels, ensuring that sounds are captured accurately without noise or distortion.
The lack of a high-pass filter means that low-frequency sounds are not attenuated before processing, which can be a consideration for users working with vocals or acoustic instruments. While some applications may benefit from a high-pass filter to reduce rumble or unwanted low-end noise, the absence of this feature allows for a more natural capture of the full frequency spectrum, which can be desirable in certain recording scenarios.
Overall, these specifications reflect the iRig Pro Duo I/O's design as a versatile and effective tool for mobile and studio recording, catering to a variety of audio sources and recording environments.
Connectivity
| Analog Audio I/O | 2x Combo XLR-1/4" TRS Balanced/Unbalanced Mic/Line Input 2x 1/4" TRS Balanced Output |
|---|---|
| Phantom Power | 48 V ± 4 V |
| Digital Audio I/O | |
| Host Connection | 1x Mini-DIN 8-Pin (on Interface) 1x Lightning (with Included Cable) 1x USB-A (with Included Cable) 1x USB-C (with Included Cable) |
The specifications of the IK Multimedia iRig Pro Duo I/O offer a range of connectivity and audio handling capabilities tailored for both mobile devices and computers. Show More
Starting with the **Analog Audio I/O**, this interface features 2x Combo XLR-1/4" TRS balanced/unbalanced mic/line inputs. This versatility allows users to connect a variety of audio sources, whether they are microphones or instruments, making it suitable for different recording scenarios. The inclusion of 2x 1/4" TRS balanced outputs ensures high-quality sound delivery to external monitors or mixers. The capability to handle both balanced and unbalanced connections minimizes noise and interference, enhancing the overall audio quality.
Next, the **Phantom Power** specification provides 48 V ± 4 V, which is essential for powering condenser microphones that require external power. This feature is crucial for professional audio recordings, ensuring that users can utilize a wide range of microphones without needing additional equipment.
As for the **Digital Audio I/O**, it's noted that there is none available. This indicates that the interface focuses on analog connections, which can be a consideration for users who specifically need digital audio capabilities.
The **Host Connection** options are diverse, including a Mini-DIN 8-Pin connector on the interface itself, as well as Lightning, USB-A, and USB-C connections, all with included cables. This range of connectivity ensures compatibility with various devices, including iOS devices and computers, allowing for flexible use in different environments. It provides users with the convenience of connecting easily to their preferred platform, enhancing the interface's usability across multiple setups.
Overall, these specifications highlight the iRig Pro Duo I/O as a versatile and powerful audio interface, ideal for musicians, podcasters, and audio professionals seeking a portable solution for high-quality audio capture and playback.
Performance
| Frequency Response | 10 Hz to 21 kHz /-3 |
|---|---|
| Maximum Output Level | 16 dBu |
| Impedance | 1/4" Line Inputs: 1 Megohm (Unbalanced) XLR Mic Inputs: 3.2 Kilohms (Balanced) 1/4" Line Outputs: 1 Megohm (Balanced) |
| Dynamic Range | 1/4" Line Outputs: 106 dBA |
The specifications provided for the IK Multimedia iRig Pro Duo I/O highlight its capabilities in terms of audio quality and performance.Show More
Frequency Response: The frequency response range of 10 Hz to 21 kHz with a tolerance of +/- 3 dB indicates the device's ability to accurately reproduce audio signals across a wide spectrum. This range covers the majority of audible frequencies for humans, ensuring that both low bass notes and high treble sounds are captured and output effectively. A broader frequency response allows for more detailed sound reproduction, making it ideal for musicians and audio professionals.
Maximum Output Level: With a maximum output level of 16 dBu, this specification defines the highest level of audio signal the interface can produce without distortion. A higher output level means that the device can drive various audio equipment, such as studio monitors and mixers, effectively, ensuring that the sound remains clean and powerful even at higher volumes.
Impedance: The impedance ratings for the line inputs and outputs are crucial for matching the interface with other audio equipment. The 1 Megohm impedance for the unbalanced 1/4" line inputs indicates a high input impedance, which is beneficial for connecting instruments like guitars, as it minimizes signal loss. The XLR mic inputs have a balanced impedance of 3.2 Kilohms, which helps reduce noise and interference, making it suitable for professional microphone connections. Similarly, the 1 Megohm balanced outputs ensure compatibility with a wide range of audio devices while maintaining signal integrity.
Dynamic Range: The dynamic range of 106 dBA for the 1/4" line outputs measures the difference between the quietest and loudest sounds that the interface can handle. A higher dynamic range permits greater detail and clarity in audio playback, allowing for nuanced performances and recordings. This is particularly important in professional settings where sound quality is paramount, as it enables users to capture and reproduce audio with precision.
Overall, these specifications illustrate the iRig Pro Duo I/O's capability to deliver high-quality audio performance, making it a suitable choice for both mobile recording and studio applications.
Compatibility
| OS Compatibility | macOS 10.6 or Later Windows 10 or Later 7.0 or Later 5.0 or Later |
|---|---|
| Included Software | |
| Mobile Device Compatibility | iPhone iPad iPod Android Smartphone |
| Required Hardware | Lightning Port, Micro-USB OTG to Mini-DIN Cable, Micro-USB Port, USB 2.0 Port, USB-C Port |
The OS Compatibility specification indicates the operating systems that support the iRig Pro Duo I/O. This interface is compatible with macOS starting from version 10.6 and Windows from version 10, as well as older versions of Windows down to 5.0. Having broad OS compatibility ensures that users can connect the interface to a variety of devices, making it versatile for different setups, whether on a computer or a mobile device.Show More
The Included Software specification informs users that no additional software is bundled with the device. This means that while the interface is ready to use with compatible devices, users might need to explore third-party software or DAWs (Digital Audio Workstations) to fully utilize its capabilities. Understanding this helps users prepare for their music production or recording tasks.
The Mobile Device Compatibility feature highlights that the iRig Pro Duo I/O can connect to various mobile devices, including iPhones, iPads, iPods, and Android smartphones. This compatibility is crucial for musicians and sound engineers who want to record or produce music on-the-go, allowing for a seamless integration with their mobile workflow.
Lastly, the Required Hardware section specifies the necessary physical connections to use the interface effectively. It requires a Lightning port for Apple devices, a Micro-USB OTG to Mini-DIN cable, and USB ports (including USB 2.0 and USB-C) for broader connectivity. This variety in required hardware ensures that the iRig Pro Duo I/O can be used with a range of devices, accommodating different user needs and preferences.
Power
| Power Requirements | AC/DC Power Adapter (Not Included), Battery, USB Bus Power |
|---|---|
| Battery Type | 2x AA |
| Approximate Battery Life | 3 Hour (AA NiMH, Recording) 10 Hour (AA NiMH, Playback) |
The Power Requirements section outlines how the iRig Pro Duo I/O can be powered, providing users with flexibility in different environments. It can operate on an AC/DC power adapter, which is not included with the device, allowing for stable operation when plugged in. The option for battery power means you can use it on the go, making it ideal for mobile recording sessions or performances. Show More
The device can be powered by two AA batteries, specifically NiMH types, which are rechargeable and commonly available. The approximate battery life is an important consideration for users, as it indicates how long the device can function without needing a recharge or battery replacement. For recording, users can expect around 3 hours of battery life, which is sufficient for shorter sessions. In contrast, when used for playback, the battery life extends to approximately 10 hours, allowing for longer listening sessions without interruption. This versatility in power options ensures that the iRig Pro Duo I/O can adapt to various use cases, whether in the studio or on the road.
Physical
| Dimensions | 5 x 3 x 1.5" / 127 x 75 x 37 mm |
|---|---|
| Weight | 6.9 oz / 197.0 g |
The Dimensions of the IK Multimedia iRig Pro Duo I/O indicate its physical size, which measures 5 x 3 x 1.5 inches (127 x 75 x 37 mm). This compact design makes it highly portable, allowing musicians and audio professionals to easily transport the interface for use in various settings, whether in a studio, at home, or on the go. The small size does not compromise functionality, as it still accommodates essential features for audio and MIDI processing. Show More
The Weight of the device is 6.9 ounces (197.0 grams), which reinforces its portability. A lightweight audio interface is advantageous for users who travel frequently or work in different locations, as it can easily fit into a laptop bag or backpack without adding significant bulk. This combination of compact dimensions and light weight ensures that the iRig Pro Duo I/O is user-friendly and convenient for mobile recording and performances, making it an excellent choice for musicians and creators who need reliable equipment that can be easily carried around.
Packaging Info
| Package Weight | 1.1 lb |
|---|---|
| Box Dimensions (LxWxH) | 8.9 x 6.3 x 2.8" |
The Package Weight of the IK Multimedia iRig Pro Duo I/O is 1.1 lb, which indicates that the product is lightweight and easily portable. This feature is particularly beneficial for musicians and audio professionals who require an interface that can be conveniently transported for live performances or studio sessions on the go. The manageable weight ensures that it can be included in a travel bag without adding significant bulk or strain.Show More
The Box Dimensions measure 8.9 x 6.3 x 2.8 inches, providing insight into the size of the packaging. These dimensions suggest that the iRig Pro Duo I/O is compact, making it suitable for tight spaces, whether on a desktop or in a travel setup. The compact size enhances portability, allowing users to easily fit the interface alongside other equipment or accessories. Overall, both the package weight and box dimensions highlight the product's design for mobility and convenience in various audio applications.
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Customer Questions
How do I connect the iRig Pro Duo I/O to my iPhone?
To connect the iRig Pro Duo I/O to your iPhone, use the included Lightning cable. Plug the Lightning end into your iPhone and the other end into the iRig Pro Duo I/O's USB port.
Why am I not getting any sound from my iRig Pro Duo I/O?
Ensure that your input levels are properly set and that the gain knobs are adjusted. Also, make sure your headphones or speakers are securely connected and the volume is turned up.
How do I install the drivers for the iRig Pro Duo I/O on my computer?
The iRig Pro Duo I/O is class-compliant and does not require additional drivers for Mac and iOS devices. For Windows, download and install the iRig ASIO driver from the IK Multimedia website.
Can I use the iRig Pro Duo I/O with Android devices?
Yes, the iRig Pro Duo I/O is compatible with Android devices that support USB OTG (On-The-Go) and have appropriate audio/MIDI apps installed. Use the included mini-DIN to USB cable.
How do I power the iRig Pro Duo I/O?
The iRig Pro Duo I/O can be powered by two AA batteries, the included USB power supply, or via your computer or mobile device’s USB port.
Why is my MIDI keyboard not working with the iRig Pro Duo I/O?
Ensure that your MIDI cables are connected correctly, and that the MIDI IN and MIDI OUT ports are properly assigned in your DAW or MIDI software.
How do I update the firmware on the iRig Pro Duo I/O?
Visit the IK Multimedia website and download the iRig Pro Duo I/O firmware updater. Follow the instructions provided to update your device.
Why am I experiencing latency issues with the iRig Pro Duo I/O?
Check your DAW’s audio buffer settings and reduce the buffer size for lower latency. Also, ensure that your computer’s performance settings are optimized for audio processing.
Can I use condenser microphones with the iRig Pro Duo I/O?
Yes, the iRig Pro Duo I/O has phantom power available for condenser microphones. Ensure that phantom power is enabled by pressing the phantom power button.
How do I monitor my audio input on the iRig Pro Duo I/O?
Connect your headphones or monitor speakers to the headphone output on the iRig Pro Duo I/O. Adjust the headphone level using the volume control knob.