Chopmatic: Sampler Beat Maker

Chopmatic is a sampler, sample chopper and beat maker for producers who sample. Open any song, break or sample, or record one with the mic, chop it to the beat, play the slices on drum pads, build beats on a multitrack sequencer, mix them, arrange a song and export everything. It comes with a royalty-free starter kit and splits any track into vocals, drums, bass and other on your device, on a panel built like hardware. It works offline once the stem model has downloaded. No account. No upload. No subscription.

Made for hip-hop, lo-fi, house and jungle producers who build tracks from chopped breaks, old records and found sound, and for anyone learning to sample.

ROYALTY-FREE STARTER KIT
• The Chopmatic Kit: sixteen drums, on the pads the first time you open the app
• FM drums, keys, bass, loops and breaks made with the Rithmatic app
• Crate kits of hits cut from old records
• Six public-domain records from 1907 to 1924, from James Reese Europe and Jelly Roll Morton to Caruso, each with a link to its source
Every sound is royalty-free: use it in your releases.

CHOP SAMPLES YOUR WAY
• BARS: slices on a tempo grid from 1/4 to 1/32 notes
• LOOPS: finds the half-bar, 1, 2, 4 and 8-bar loops that really loop
• SPIKES: a cut on every hit, even on a dusty, crackly record or breakbeat
• EQUAL: even slices, from 4 to 64
• MANUAL: tap the waveform to cut, drag any edge
• LAZY CHOP: play the sample and tap pads to cut where you hear the hits
• STRETCH: time-stretch to a new tempo without changing the key, or pitch-shift without changing the tempo, with KEEP FORMANTS for voices
Chopmatic detects the tempo (BPM) and the key and names every slice: KICK, SNARE, HAT, a chord, a note.

PLAY THE PADS
Pads sound the moment you touch them, MONO or POLY. Each has PITCH, GAIN, FILTER, an envelope, PAN, DRIVE, CRUSH, ECHO and REVERB, and plays as LOOP, ONE SHOT or GATE. REPEAT is note repeat locked to the beat; 16 LEVELS plays one chop across 16 pads. Plug in a USB MIDI pad controller and it just plays, with ready mappings for the MPK Mini, Launchkey Mini, MiniLab 3, MPD218 and nanoKONTROL2, and MIDI LEARN for anything else.

SEQUENCE, MIX AND ARRANGE
• 16 sequences of 1 to 16 bars on a grid of chunky squares
• Tap steps, drag to paint, or press RECORD and play live, with a metronome: every hit lands where you heard it
• QUANTIZED or HUMAN with SWING; hold a hit and drag it off the grid in fine steps
• MAKE A KIT finds your kick, snare and hats; PATTERN lays a beat on them
• A mixer: level, pan, drive, crush, echo and reverb on every track, and GLUE to hold it together
• RESAMPLE TO CHOP bounces a sequence back into a sample to flip
• Arrange sequences into a song; drag anything anywhere, and UNDO it all

STEM SEPARATION
Split any sample into drums, bass, vocals and other on your device, then chop each one: pull out an acapella, or chop the drums of a break on their own. Your audio never leaves your device.

EXPORT EVERYTHING
• Slices, a pad, a sequence or the song, from the menu or any tile
• Sampler kits for SFZ and Decent Sampler, sliced WAVs and OP-1 drum kits
• Mix, tracks, MIDI and stems
• Sessions, to open on another device
WAV at 16, 24 or 32-bit float, or AIFF, with root keys, loop points and tempo.

MADE TO BE PLAYED
Every hit lands on its exact sample, pitched pads stay clean two octaves up, a limiter keeps loud kits from clipping, and the audio runs with low latency. Light or dark, with five accent colors. Works with TalkBack. Opens WAV, AIFF, MP3, AAC, FLAC and video soundtracks.

FREE TO TRY, THEN PAY ONCE
Everything is unlocked for your first 24 hours. After that, chopping, the pads, SEQUENCE and SONG stay free for good, and one payment of $5.99 unlocks exports and stem separation forever. No subscription, no account, no ads.
Already bought Chopmatic? You keep everything.

Recent changes:
• Stem splitting now works reliably on Android. If the app used to close while splitting a song, this update fixes that.
• Phones with a 32-bit processor can't split stems, and the app now tells you so clearly.
• Exported pads keep their own echo and reverb tails, and changing tempo while playing stays on the beat.
• Steadier MIDI timing.