MICROGRAM M1 is a free software synthesizer developed by Novaflash. Available format(s): VST for Windows.
Features:
- Virtual analog semi-modular polyphonic synthesizer.
- Flexible routing.
- Micro-sequencer.
- 2 “flavors” of LPF/HPF (36db/oct).
http://www.numerisson.com/novaflash/