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


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.


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.



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
Rated 4+
© Nick Collins


  • Family Sharing

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

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