SMPLER is made by Blacksketch Studio. It is built on the open-source components listed below. Thank you to their authors. The same list, with the full license texts, is in the app under Credits.
SMPLER uses the SoundTouch audio processing library. Two of its files were modified on 6 October 2026:
AAFilter.cpp — the work buffers of the anti-alias filter design live on the stack up to 256 taps, so a live pitch change allocates no memory. The computation is unchanged.FIRFilter.cpp — the coefficient buffers are reused when the filter length does not change. The coefficients are written exactly as before.The download below is the complete source code of the modified SoundTouch library used in SMPLER 1.0 (build 69), with its notice and the full license text.
Download the source · ZIP · 89 KBRelinking. To relink SMPLER with your own modified version of SoundTouch, request the object files of the application by writing to contact@smpler.art. This offer is valid for at least three years from the last distribution of this version, free of charge.
License text: GNU LGPL v2.1
| Component | Author | License |
|---|---|---|
| MSFA (Music Synthesizer for Android) | Google Inc. (Raph Levien), Pascal Gauthier | Apache License 2.0 — modified by SMPLER (synth.h, controllers.h, env.cc, fm_voice_note.cc/.h, renamed) |
| Open303 | Robin Schmidt (rs-met.com) | MIT License |
| FFT package (fft4g) | Takuya Ooura | Free license, commercial use allowed |
| Dattorro reverb | Pauli Pölkki (el-visio), after Jon Dattorro | MIT License — modified by SMPLER |
| TapeDelay2 (Airwindows) | Chris Johnson (airwindows) | MIT License — modified by SMPLER |
| Signalsmith Stretch 1.3.2 | Geraint Luff / Signalsmith Audio Ltd. | MIT License |
| Signalsmith Linear 0.6.4 | Signalsmith Audio | MIT License |
| miniz | Rich Geldreich, RAD Game Tools, Valve Software | MIT License |
| Robot (font) | Fortress Tech | 100% Free, “Free for anything” |