Audio, MIDI and instrument tracks: what's the difference?

The difference between audio, MIDI and instrument tracks is what each one holds. An audio track plays recorded sound: a vocal, a guitar, a sample. A MIDI track holds notes, which are instructions rather than sound. An instrument track is a MIDI track with a virtual instrument loaded on it, so those notes come out as a piano, a synth or a drum kit. Every song you build in a DAW is some mix of the three, plus a couple of helper tracks for the mix.

This page is part of DAW 101 (hub: what is a DAW). Previous: arrangement view vs clip view.

Audio tracks: sound you recorded or imported

Ableton's manual puts it simply: "Audio signals are recorded and played back using audio tracks" (Ableton). A microphone take, a guitar through an audio interface, a drum loop you dragged in: all audio. You edit audio by cutting, moving, fading and stretching the waveform. You cannot easily change a single note inside a recorded chord, because the track holds the sound itself, not a list of notes.

MIDI tracks: notes, not sound

MIDI is the other half. The MIDI Association, which maintains the standard, is blunt: "MIDI is not audio." It is "only performance instructions and not a digital version of a sound recording": note messages "tell the MIDI devices what note to play" and velocity messages say "how loud to play the note" (MIDI Association). That is why MIDI is so flexible. Change one note, change the tempo, swap a piano for strings: the instructions stay, only the player changes. The full comparison is in audio vs MIDI.

Instrument tracks: MIDI plus a sound

A MIDI track on its own is silent. "It takes an instrument to convert MIDI signals into audio signals that can actually be heard" (Ableton). Load a virtual instrument on the track and you have what many DAWs call an instrument track. The notes live in the piano roll; the sound comes from the instrument. More on those in virtual instruments explained.

Two rules beginners hit in week one:

• Tracks have a type. In Ableton, "Audio clips cannot be added to MIDI tracks and vice versa" (Ableton). Drag a WAV onto a MIDI track and nothing happens.
• Recording needs the right track. A microphone records to an audio track; a MIDI keyboard records notes to a MIDI or instrument track. See setting up a MIDI keyboard.

Helper tracks: returns and groups

Two more track types exist for mixing, not for parts:

• Return tracks (also called aux or FX returns) hold shared effects. In Ableton, "return tracks can host effects devices", and a send knob on each track decides "how much of the track's output feeds the associated return track's input" (Ableton). One reverb on a return can serve every track.
• Group tracks (or buses) sum several tracks so you can process them together. Ableton calls a group track "a special kind of summing container" (Ableton). Our bus processing guide goes deeper.

Every track type at a glance

How an AI DAW handles track types

AI tools are wearing down the wall between audio and MIDI, which is the most useful thing to know as a beginner.

• Audio becomes MIDI. In Veena you can hum a melody or tap a rhythm, then ask CoProducer to transcribe it; the help page says it "turns your recorded melody or percussive performance into editable notes", and that a phrase "can move from piano to strings or a synth without another transcription" (Veena).
• One audio track becomes four. Stem separation splits a finished mix into new audio tracks. Veena's version gives four stems (vocals, drums, bass and other), laid out "time-aligned" beside the original, which it mutes rather than deletes (Veena). Our stems guide explains what stems are.
• Tracks stop caring about type. In Veena a single track "holds audio, MIDI, drum, sampler or video clips" (Veena), so you don't need to set the right track type before you start.

And the AI writes parts the way a session player would: it creates instrument tracks with real notes you can open and edit, not a flat recording. That is the line between an AI DAW and a text-to-audio generator.

What we think

Track types used to be a gate: you had to understand them before you could make anything, and every forum thread about "my keyboard won't record" is someone on the wrong track type. They still matter, because the mix logic of returns and groups is the same in every DAW. But the hard wall between "sound I recorded" and "notes I can edit" is going. When a hummed idea can become an editable bassline and a finished song can be split back into parts, the practical question changes from "what type of track is this?" to "what do I want this part to do?"

That is the right question for a beginner, and it is why we think AI DAWs such as Veena are a better first studio than the old setup-first approach. Learn the five track types, but don't let them stop you from starting.

Next in DAW 101: the DAW mixer explained.

FAQ

What is the difference between a MIDI track and an instrument track? A MIDI track holds notes and sends them somewhere; an instrument track is a MIDI track with a virtual instrument loaded, so the notes play as sound inside the DAW.

Can I turn an audio track into MIDI? Yes. Many DAWs and AI tools can transcribe a recording into notes. In an AI DAW you can hum or play a phrase and ask for it as editable MIDI.

Why is my MIDI track silent? Usually there is no instrument on it, or it points at hardware that is not connected. Load a virtual instrument on the track and play again.