SID instrument

The SID instrument drives one oscillator of NullPerator's emulated SID chip. Up to three SID instruments can be allocated, matching the chip's three oscillators.

Voice settings and the shared SID filter live in one scrollable list.

Parameters

Field	Values	Default	Behaviour
OSCILLATOR	0–2	0	SID voice used by this instrument.
PULSEWIDTH	000–FFF	800	Duty cycle of pulse-containing waveforms.
WAVEFORM	Nine choices	Triangle	Off, triangle, saw, triangle+saw, pulse, triangle+pulse, saw+pulse, triangle+saw+pulse, or noise.
OSC SYNC	NO, YES	NO	Hard-syncs the oscillator to the preceding SID oscillator.
RING MOD	NO, YES	NO	Enables ring modulation.
ENV ADSR	Four hex digits	2282	Attack, decay, sustain, and release nibbles.
FILTER	NO, YES	NO	Routes this oscillator through the SID filter.
CUTOFF	000–7FF	1FF	Shared SID filter cutoff.
RESONANCE	0–F	0	Shared filter resonance.
MODE	LP, BP, HP, NOTCH	LP	Shared filter response.
VOLUME	0–F	F	Shared SID chip output volume.

Hold Enter on ENV ADSR, use Left / Right to choose a nibble, and use Up / Down to edit it.

Shared state

CUTOFF, RESONANCE, MODE, and VOLUME represent chip-wide registers. Changing any of them on one SID instrument changes the value seen by the other SID instruments. FILTER remains per oscillator because it controls whether that voice is routed into the shared filter.

Assign the three instruments different OSCILLATOR values when you want a conventional three-voice patch. Two instruments targeting the same oscillator overwrite the same SID voice state.

Note range

The emulated SID frequency table accepts the displayed range C0–B7. Notes outside that range are rejected rather than wrapped.