By Tug·July 20, 2026·5 min read

Mixer vs Audio Interface: What's the Difference?

An audio interface gets sound into your phone or computer. A mixer blends several sound sources together. They do different jobs, they overlap more than they used to, and plenty of modern gear does both. Here is the difference and how to tell which one you actually need.

Connection versus blend

An audio interface's job is to get audio into and out of a phone or computer as clean digital sound. A mixer's job is to take several sources, set their levels and blend them together. An interface is about the connection, a mixer is about the blend.

The reason people get confused is that many modern mixers also work as interfaces, so a single box can do both.

What an audio interface does

An interface converts a microphone or instrument signal into digital audio and sends it over USB to your device, and plays audio back out. Inside it are the mic preamps that lift a quiet microphone to a usable level, the phantom power a condenser needs, and the analog-to-digital converter that does the actual conversion, which is where a lot of the recording quality comes from. Most have one or two inputs, some have more.

If your goal is simply to record a mic or a synth into your phone, an interface is the piece you need.

What a mixer does

A mixer takes many inputs at once, mics, instruments, other gear, and gives each its own level, and often EQ and pan, then sums them into a blend. Traditionally that blend fed speakers or a PA, and a plain mixer does not connect to a computer at all.

If your goal is to combine several sources, especially live, and balance them by hand, that is a mixer's job.

Where they overlap

Most modern mixers now include a USB output and act as an audio interface too, so they blend your sources and send them to a phone or computer. The Zoom LiveTrak and Tascam Model series are examples. Multi-input interfaces borrow mixer tricks too, like zero-latency input monitoring and loopback for routing audio between apps.

So a USB mixer is genuinely both, which is why the line between the two has blurred.

Which do you need, and where Reel fits

For one or two sources into a phone, an interface is all you need. For blending several sources live and recording the result, choose a mixer that also works as a USB interface. Either way, Reel records from it, as long as it is class-compliant, so you can pair Reel with a simple interface or a full USB mixer like the Zoom L6. There is a third shape now. Reel can send each of its four tracks to its own pair of interface outputs with a stereo master alongside, so the mixing can happen on hardware after the phone has done the recording. A small unit like a TX-6 takes all ten channels across five of its stereo strips and turns into the fader surface for a phone recording.

See how Reel works

A short walkthrough of how Reel records.

Frequently Asked Questions

Do I need a mixer or an audio interface?

For recording one or two sources into a phone, you need an interface. For blending several sources at once, especially live, you want a mixer, ideally one that also works as a USB interface so it can send the blend to your phone.

Can a mixer be an audio interface?

Yes. Many modern mixers, like the Zoom LiveTrak and Tascam Model series, include a USB output and work as class-compliant audio interfaces, so they mix your sources and send the audio to a phone or computer over USB.

What does an audio interface do?

It converts microphone and instrument signals into digital audio and sends them over USB into a phone or computer, and plays audio back out. It is how you get good-quality external sound into a device for recording.

Do I need both a mixer and an interface?

Usually not. A plain interface covers one or two inputs, and a USB mixer covers both jobs at once. You only need a separate mixer and interface for larger or more specialised setups.