SunVox by Alexander Zolotov
SunVox is a small, fast and powerful modular synthesizer with pattern-based sequencer (tracker). It is a tool for those people who like to compose music wherever they are, whenever they wish. On any device. On any system. And it’s free for most of the systems, except the Android and iOS.
highly optimized synth algorithms, flexible architecture; SunVox works on a variety of devices with different CPUs;
supported sound systems: ASIO, DirectSound, MME, ALSA, OSS, JACK, Audiobus, IAA;
SunVox as a plugin: AU instrument for iOS;
support of 16/24/32-bit WAV, AIFF and XI samples;
multitrack WAV export;
XM (FastTracker) and MOD (ProTracker, OctaMED) import;
generative music features: random selection of notes, random values of controllers, probability effects; see examples;
free cross-platform library for developers is available; so it’s possible to use SunVox engine in your own applications;
a lot of built-in modules (synths and effects).