MillSO USB Recording Audio Interface with 3.5mm Mic and Headphone Jacks

At just 8 g, this compact MillSO USB audio interface is easy to carry between a practice space and a computer setup.

Its USB connection and separate 3.5mm microphone and headphone jacks bring recording and listening together in one small adapter.

Use it to record an electronic keyboard, electric guitar, vinyl playback, or smartphone audio to a computer. The 48 kHz maximum sample rate and built-in smart chip support a practical setup for recording and monitoring.

What to know

Connect the adapter to a computer, then use the microphone jack for an audio source and the headphone jack to hear playback or monitor your performance in real time. The independent ports make it easier to listen while recording, whether you are capturing a musical idea, practicing along with a track, or speaking during a livestream or video call.

The metal housing and built-in smart chip are part of this external sound card’s compact design. It is driver-free and plug and play, so it can fit into a simple computer-based recording workflow without setting up a larger collection of audio gear. Compatible operating systems include Windows, macOS, Linux, Android, and iOS.

For instrument connections, a MillSO 6.35mm male-to-3.5mm audio cable enables recording an electric guitar or electronic keyboard. To transfer audio from a vinyl source, use a MillSO 3.5mm male-to-male cable. Both cables are sold separately. A USB-C male-to-3.5mm male cable enables the described smartphone connection to the adapter’s microphone port. Which source do you want to bring into your computer first?

Getting the most from it

For a guitar practice session, connect the instrument using the appropriate cable, plug the interface into the computer, and connect headphones to hear what you are playing as you record. The same basic arrangement can help when capturing keyboard parts or recording vinyl audio for digital listening. The headphone jack also makes the adapter useful for voice recording and online conversations when you want to listen while using the microphone input.

This is a focused option for someone who wants a portable USB adapter with recording and headphone monitoring in one device. If your goal is to connect a selected audio source to a computer and monitor through headphones, its direct setup offers a simpler approach than assembling a larger recording system.

Who it’s for

It suits you if you want to record musical ideas from an electric guitar or electronic keyboard, digitize vinyl playback, or capture smartphone audio on a computer. Its 8 g weight and portable format are handy for musicians who practice in different places, while the separate mic and headphone jacks support listening during recording. It can also serve everyday computer use such as voice chat and video calls, with music playing alongside a conversation.

Before you decide

Which devices can I use as audio sources? The listed compatible devices include electric guitars, electronic keyboards, vinyl records, smartphones, and 3-pole TRS microphones. The required source cable depends on the connection, including the separately sold cables described above.

Which operating systems are supported? The listed operating systems are Windows, macOS, Linux, Android, and iOS.

Can I monitor audio while recording? Yes. Connect headphones to the 3.5mm headphone jack to hear your performance or recording in real time while using the separate 3.5mm microphone input.

Is it worth it?

For musicians and home creators who want a portable way to bring guitar, keyboard, vinyl, or phone audio into a computer, this MillSO interface combines USB recording, separate 3.5mm mic and headphone connections, and real-time monitoring. It is a practical fit for compact practice and recording setups.