Play Your Studio As One

A Polyphonic Voice Distributor App for Mac.

Polymer lets you play your monophonic synths together, like they're all part of some giant mutant polysynth. And it operates via plain old MIDI, so it's compatible with almost anything — modulars, samplers, even virtual instruments.

That's just the tip of the iceberg: alternate notes between different synths in monophonic sequences, layer pads and leads to create songs without leaving the keyboard, or experiment with the outer limits of modular paraphony.

You’ll never look at your synth rack the same way again.

Free Demo

macOS 10.14 or later


Buy Now

$19.99 on the Mac App Store

Polymer Screenshot

Let's Break It Down

Intuitively work across multiple color-coded MIDI interfaces

Animated voice display makes it clear which synths are playing now

Versatile options — inspiration is always at arm's reach

Now You've Got MIDI POWER

Everything the 5-pin DIN touches is your kingdom.

Polymer works via the MIDI protocol, which has been around for over 30 years. Your favorite synth, sampler, or sequencer is probably MIDI-compatible!

Intuitively work with multiple interfaces.

Merge notes from multiple inputs. Play chords across synths connected to your computer via different MIDI interfaces.

Soft synths too!

Polymer is designed for controlling hardware synthesizers, but there’s no stopping you from controlling any soft synth that can be addressed via the macOS IAC Bus.



  • Control up to 32 MIDI channels simultaneously, for 32-voice polyphony
  • New in version 1.1 Even combine polyphonic synths — supports multiple voices per MIDI channel
  • MIDI Merge between unlimited MIDI input channels
  • Velocity, Pitch Bend, and Mod Wheel data are transmitted automatically
  • Two Algorithms for voice allocation — Static starts at the same voice each time, while Cycle alternates in round-robin fashion
  • Forward, Backward, and Random Direction options for choosing the next voice
  • Supports Voice Stealing, allowing for continuous play regardless of available voices
  • Still curious? Check out the Help Documentation!


  • A Mac running macOS 10.14 or greater
  • Several MIDI-compatible hardware or software sound modules, and a MIDI interface & cables to connect them
  • A main MIDI keyboard or sequencer. Can be hardware connected to your computer, or software-based through the macOS IAC bus.

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