Changes
/* Comparison of the SID and AY-3-8912 */
* 3 tone channels
* 4 waveform types (sawtooth, triangle, pulse, noise), selectable per channel
* Ring-Modulation
* FiltersProgrammable filter
* Programmable hardware envelopes on any channel
AY:
* 3 tone channels, (square waveforms only)* 1 noise channel
* 1 hardware envelope (with programmable waveform)
* the volume for each channel can be set or controlled by the hardware envelope.
