MPE-compatible full audio range triple-synth playground

Shoom Screenshot

Shoom is an expressive XY pad synthesizer. Or, more precisely, three identical synthesizers in one app. It is capable of playing any pitch in the audible range and doesn’t necessarily limit you to a particular scale. Nevertheless, if you do want to use scales, Shoom can deliver anything from common 12-tone equal tempered to xenharmonic and microtonal.

"It only took me about twenty minutes of playing around with this app before I fell in love with it. It’s really well made and the overall sound of Shoom speaks to the experimental side of me."
- Jakob Haq, haQ attaQ

"It’s a bargain, it sounds fantastic, and it’s fun. A no brainer purchase."
- David A Israel, SmiteMatter

"...if you like abstract, ambient, electronic music and the occasional dose of soundscapes and just plain weird noises, then Shoom is going to be very much for you."
- John Walden,

"At that price, and with this much power, it’s just about the most musical fun you can have with any app around."
- Warren Burt, SoundBytes Magazine


Shoom playlist (7 videos)
Shoom playlist (7 videos)


  • Three independent synthesizers
  • 8–20,000 Hz pitch range
  • Slide freely or snap notes to scale with adjustable glide rate
  • Set notes to infinite hold using a dedicated toggle
  • Microtonal and non-octave repeating scales support
  • MIDI note input (including MPE), CC control and clock sync
  • Optional remapping of MIDI notes to the pitches of the selected scale
  • Bluetooth MIDI support
  • Inter-App Audio support with main mix and individual synth outputs
  • Audiobus 3 support (including Audiobus MIDI)
  • Ableton Link support
  • 120+ bundled presets
  • Import and export of presets and CC maps

Synthesizer engine

  • Adjustable polyphony, up to 30 voices
  • Two oscillators with 4 waveforms and PWM, and one noise generator
  • Oscillator FM cross-modulation
  • 4-pole (24 dB/octave) resonant low pass filter with overdrive and pitch tracking
  • 2 variable slope ADSR envelopes for amplitude and filter cutoff
  • 2 LFOs with 9 waveforms, up to 3 out of 12 simultaneously assignable parameters, trigger and global running modes, fade-in and phase controls
  • Y-axis position / MIDI CC#74 as modulation source with up to 3 of 15 simultaneously assignable parameters
  • MIDI channel pressure / polyphonic aftertouch as modulation source with up to 3 of 15 simultaneously assignable parameters
  • MIDI velocity modulation of amplitude and filter envelopes
  • Note pan randomizer
  • Built-in stereo delay and reverb effects


iOS 9.0+

Standalone: Inter-App Audio, Audiobus 3, Ableton Link
iPad only