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Unlocking new potentials of FM synthesis.

Frum is a radically new FM Drum Synthesizer, incubated after many years of research and development into FM synthesis. You may imagine FM sounds to be clear and harmonic, but those are just the start of the possibilities FM has to offer. More potential is unleashed by harnessing the unlimited, free power of complex sound waves.

Close sound encounters of the third kind.

Traditionally, FM synths are overwhelming, with too many parameters to control the sound texture. Frum bundles many of these parameters together in the BUG button, offering entirely new textures each time the button is pressed. It’s easy to find and tweak these sounds to make drums, other percussion, fat bass, organic noises such as insect songs, environmental sounds, human screams, as well as all sorts of intriguing melodies.


• The sounds are at your fingertips.
With Frum, we had to rethink the existing UI design for hardware and software synthesizers, bringing the power of FM to the iOS touch screen. The vertically scrolling sequencer allows you to enjoy single-handed, stress-free control of the UI.
• Rearrange blocks to compose music.
Entire songs can be composed by rearranging pattern blocks with your fingers. Complex arrangements and organisation is possible with the user having control over song name, pattern block colors, loop counts and durations.
• Share your song on the timeline.
From incorporates SNS technology, allowing you to listen to hot new tracks from around the world, as soon as somebody shares them. Let people know what you think, and get feedback on your own tracks, via the like button, and comments section.


• Sound engine
Oscillators : FM/PM synth with 4 operators( sine, square, triangle )
Tracks : 4 ( can extend to 4x4 pads using the ‘Pad division’ function )
Filter : High, Band and Low pass filter
Effectors : Overdrive, Auto Pan
Features :
Generating BUG, Pad division, UNDO, REDO, Live edit, Save and load presets (factory/private)

• Pattern Sequencer
Step resolution : 1/16
Maximum step: 64 (4 bars)
Gate input, Keyboard input, parameter input in Motion edit mode, Copy and paste, Step shift

• Song (Pattern Block)
Maximium patterns : 150
Pattern Block Properties : Name, Color, Loop count, Mute
Features :
Drag & drop, Duplicate, Delete, Delete All

• Settings
Audio Recording and Exporting
BPM Stepper
Mixer : 4 track volume faders + 1 master volume fader with a limiter
Other Features :
Shuffle, Mute, Pad Division, Pad sound switch, and so on

• Other functions
SNS (Timeline, Popular, Recommended, Demo)
Account management, Account synchronization, Create account

You need INTERNET connection to use the app.
Tested devices:iPhone 5, iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 5 SE, iPhone 7, iPhone 7 Plus, iPad Air, iPad Air 2, iPad mini 2

What's New

Version 1.1

Fixed the crash when certain track is played.
Added audio recording and exporting function.

Ratings and Reviews

4.1 out of 5

13 Ratings

13 Ratings

Great concept, not quite there

Oceans in space

This lil beatbox/symth fm tripper is good for the random frum bug(sampling it), as well as making beats to sample them. The reason why is - it is glitchy in a non idm way-it wont run well in real time. The beats stutter stop or even a full on crash! And its iphone 7 and 7+ i also think i tried on i pad with weak performance. On the bright side the fm design and overal trippy app vibe is cool. The frum bug makes the fm aspect really standout and its sick, it just wont run as the electribish standalone box it could be. It deserves a solid cpu engine urgent care. Lets get this bug healthy and ripping optimized so it rocks on a 7 or ipad! Then i be so happy and spread the word, i see your vision....

Lost midi functionality. What a bummer.


I have occasionally played around with this app and found it to be a fun, bizarre noisemaker. It used to work with my Akai MPK mini. The pads on the MPK mini brought out the full expressiveness of the app, which I was never able to replicate just tapping my screen (iPhone 6s with iOS 11). Now I can’t plug in my controller without the app instantly crashing. It’s extremely disappointing. I’m hoping I’ll have an opportunity to update my review, because I had quite a blast playing around with this thing when it was fully functional. :(



There's something about Frum that's just utterly unique and fantastic: this app is Alive and has a real indescribable "something extra" in terms of ghost-in-the-machine presence. Start playing with it and if you're like me you'll quickly be rewarded by sounds and patterns that just can't be reproduced anywhere else. Untypical and indispensable: Frum is truly special.


3.5 MB
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Japanese
Age Rating
Rated 4+
© 2016 TORICO, Inc.


  • Family Sharing

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

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