iPhone Screenshots


TOPLAPapp is a sonic puzzle based around a virtual machine for sound synthesis. This machine accepts a few valid instructions represented by the letters T, O, P, L, A, and p, and you control it by placing each command letter within a grid, along with setting some associated parameter sliders. The machine rushes through the instruction set to create output sounds, which are usually of a somewhat noisy character, hopefully interestingly so. The historical antecedents include instruction synthesis as pioneered at the Institute of Sonology in the 1970s, and the live coding movement, of modifying a running program as it acts. This app is intended for those interested in more experimental sonic art: don't download unless you are open to stranger computer music sounds ((http://www.toplap.org).

What’s New

Version 1.2

64-bit builds for iOS 11 compatibility

Ratings and Reviews

4.5 out of 5
2 Ratings

2 Ratings

dkamionk ,

Highly engaging!

Probably not for everyone, but definitely great for me. Great for exploring alternative sound aesthetics and being blind to the actual parameters you are controlling is a great exercise in letting your ears do the work unfettered by cerebral filters.

Thanks to this app, I now know about the fascinating world of livecoding. Thanks for this great new toy/tool.

Craig8128 ,

The bleeding edge!

It makes me so happy to see this get an update! This is one of the first music apps I ever downloaded, and while the results are often somewhat harsh, this app is a real 'eye-opener' for some of the truly original and unusual things one can do with music and sound in iOS.

pighood ,


Frustratingly, deliciously cryptic...would be nice to have an "expert" mode where you could actually see the controls...and perhaps have a way to adjust pitch. I think of this thing as a buchla skeletoid nectarine blastocyst with social adjustment issues. Nicholas...how about a synth app along these lines with bizarre editing controls?


Joshua Parmenter
487.4 KB

Requires iOS 7.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

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

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