iPad Screenshots


FM 304 is a set of Three 4 operator FM synths, each with integrated sequencers and onboard effects. FM 304 exposes all synth parameters with a one knob per function paradigm, allowing for quick, fun and intuitive real-time manipulation and creation of tunes and sounds.

Tech specs
— 3x four op FM synth
— 3x LFO
— 3x 16 step sequencer
— Effects: delay, reverb, chorus
— 100 save slots
— 8 algorithms
— Note frequency quantize

Ratings and Reviews

4.3 out of 5
4 Ratings

4 Ratings

Oceans in space ,

Mind blowing fm beats

Very unique, and 4 fm drum synths in a window with all parameters! I feel the need to be minimal as is the app, yet the results are very intense and insane fm capacity overflowing the wires in the mind of the iPads soul. Seriously great idea to just put all the knobs and sliders on one page to ease the overwhelm.


Great sounds to be had no real way to tie in to any other music apps

Lacks any Audiobus, audio unit, or iaa support. I love some of the devs apps just don’t like that it’s hard to integrate into my production. Shoot even a way to midi up and play from external is not possible. I wish he would add some of this functionality to some of his other apps I’ve purchased as well. Gladly throw 4-5 stars even if we could record our performances to .wav something throw us a bone here dev.

rcon303 ,

fm sequencing madness!

sounds great and alot of fun!i wish the knobs were bigger its hard to adjust on ipad mini .


Paul Betowski
25.2 MB

Requires iOS 9.0 or later. Compatible with iPad.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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