http://www.swinkels.tvtom.pl/swinsid/
CarlFeatures of SwinSID X2:
- Two AVR cores for double performance (48 MIPS)
- Two SID chip emulation
- Nearly full software compability with SID
- 6 voices
- 2 oscillators per voice with adjustable phase and mixing mode
- 16 waveforms stored in flash ROM
- Exponental ADSR volume fades without envelope bug
- White noise generator with pitch regulation
- FM modulation between voices
- Hard sync modulation
- Built-in socket for optional SID chip
- Lowpass filter with self-oscillating resonance
- Standard 4 bit sample playback as 4th voice
- Extended sample playback mode (6 channels x 8 bit)
- 2x oversampling to minimize aliasing effect
- 16 bit mixing and output
- 31,25 KHz sampling rate