Sunvox is a cross-platform (including mobile) realtime softsynth designed by Alexander Zolotov, using Pixilang, a pixel-oriented programming language. The GUI layout includes a microtonal sequencer, spectriscope window, timeline section and instrument section. This last section has a modular design. It includes many built-in synth and effects modules, and includes several synthesis methods, from subtractive to FM to spectral voice (FFT) modulation, as well as sound sample importing. Modules can be sound generators or modulators of sound generators. Drumkits can also be created.
A complete manual (also in other languages) is available at the WarmPlace website here: Sunvox Manual
Sunvox at WarmPlace.ru