Percussive Synth 4+

The Jamming Machine

Vadym Rostok

Designed for iPad

    • 4.7 • 3 Ratings
    • $8.99



Inspired by analogue design, this synth was intended to be your percussion but ended up being much more.

Percussive synth will accompany you while you jam, be your groove experimentation space, or be your source of recording material you may export and mix in a DAW.
Fine control over many virtual analog synth parameters allows for vast sonic experimentation potential.
And unique sequencer implementation equipped with such potential creates an exceptional user experience.

The app consists of the sequencer and the synths engine:

A rhythm or a melody can be created using the sequencer. Tap notes into one of the four tracks, one track for each voice of the synthesizer. Set note's pitch and velocity using knobs. Or don't, and rely on a global track's pitch setting.
Each synthesizer voice has a completely independent set of parameter values, so you get four different synths playing polyphony.
One of the cool features of the sequencer is the ability to switch between straight and odd subdivisions - a note can be one-fourth of the bar, but also one-sixth, and one-tenth. Also, notes can overlap and re-trigger after overlap ends, which allows for creating weird rhythms when used with odd subdivisions. And if you're into drone music - BPM can go over 9000.

The basis of each voice is two oscillators and a white noise generator. Each oscillator can produce a square, saw, triangle, or sine wave shape.
The second oscillator's frequency can be discretely shifted from -2 to +2 octaves, or smoothly offset using the "osc2 freq" knob.
Oscillators' frequency can glide to a higher or a lower value - "decay time" will set the duration of this glide, and "decay amt" the frequency destination - it's quantized to octaves and fifths.
A mix of these sound sources goes into the low-pass filter.
The filter's cut-off frequency can be dynamically controlled by ADSR (attack, decay, sustain, release) module.
The amount and direction of this control are set by the "env" knob.
The second ADSR module controls the volume envelope.

- Sequencer and synths modules have separate preset managers and undo histories
- Audio can be recorded and exported as .wav files from the app
- Recording's start and end time can be quantized to the sequencer transport's start and stop
- 8-voice synth and sequencer can be used as separate AudioUnits
- Ableton Link support
- MIDI io, CC mapping
- Export preset files
- Toggle between quadratic and linear ADSR
- Toggle velocity sensitivity in knobs

What’s New

Version 1.2.2

- Ableton Link support
- Sequencer as a separate AudioUnit
- Two-column view for wide screens (iPads or iPhones in landscape mode), sequencer on the left, and synths on the right
- Per-note pitch and velocity setting
- BPM sync via midi clock

- Stopping the app after 5 minutes of background inactivity to save battery life while keeping the state of unsaved presets
- Synth params randomizer and sequence randomizer under the settings menu (want to try your luck to get a happy accident?)

Ratings and Reviews

4.7 out of 5
3 Ratings

3 Ratings

NoUserErrorHere! ,

Percussion Synth GEM

Great app and great developer who’s been implementing new features quickly. More than just a drum machine this is something of an experimental rhythmic four voice synth which has enough parameter control to create tuned percussion and beyond. The sequencer is unique and expressive and the learning curve is quick. Can’t put it down here!


So far so good

I haven’t figured the sequencer piece yet but the synth is super Kewl!

App Privacy

The developer, Vadym Rostok, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

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