underscore

the standalone desktop groovebox.

Drum machine, sampler, and sequencer

Sample and chop audio from any app on your Mac. (*macOS 14.2+)
Refine & randomize your tracks with per-step parameters and conditional logic.
Tweak your sound with built-in effects and two LFOs per track.

$40 USD + tax where applicable.
one-time purchase.
no subscription. no upsells.

watch the 45-second demo

The Underscore window: sixteen sample pads with waveform thumbnails on the left, the pattern grid and step-lock editor on the right, and a master output meter across the top.

A complete workflow in a single app.

Sample straight from your Mac. Chop samples across pads. Sequence with microtiming, step locks, and conditional logic. Export a finished WAV – all in one app.

Underscore is a native app for macOS.
No subscription.
No account.
Buy it. Own it.

Features

16 tracks. 16 patterns of up to 64 steps
Sample from any app on your Mac*, or import your own WAVs, then chop across the pads
Record real-time input from your Mac's keyboard or your favorite MIDI controller
Step locks, microtiming, and swing
Conditions, randomness, probability, ratios, and two LFOs per track
Filters, delay, and reverb
Export your track as a WAV for easy upload to your favorite platforms

*Sampling your Mac’s audio requires macOS 14.2 or later.