What's New

Audiobus 3 support
Inter-App Audio support
Background audio
Knob sensitivity adjusted for some parameters
Tempo calculation error fixed
Screen size scaling improvements

App Description

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

iPad Screenshots

(click to enlarge)

FM 304 screenshot 1

App Changes

  • April 13, 2019 Initial release
  • November 26, 2019 Price decrease: $3.99 -> $1.99
  • December 24, 2019 Price increase: $1.99 -> $2.99
  • January 13, 2020 Price increase: $2.99 -> $3.99
  • July 14, 2020 Price decrease: $3.99 -> $2.99
  • November 11, 2020 Price increase: $2.99 -> $3.99
  • November 20, 2020 Price decrease: $3.99 -> $1.99
  • December 09, 2020 New version 1.1.0
  • December 09, 2020 Price increase: $1.99 -> $3.99