Oscillator and Envelop

There are 3 oscillators on a SID chip, each with its own ADSR envelope hardwired to the VCA (Voltage Controlled Amplifier), i.e. creating a volume envelope. The filter is not connected to an envelope on the SID chip by design. However, there are ways around this as described in the tips section.

Osc Pitch

The oscillator pitch can be changed using the:

• Oct = Changes the oscillator pitch up or down in one octave steps
• Semi = Changes the oscillator pitch up or down in semitone steps
• Cent = Fine tunes the oscillator pitch

ADSR envelope and Pulse Width

• ADSR = As mentioned above, each oscillator has its own ADSR envelope. It allows control of the Attack, Decay, Sustain and Release time of each oscillators VCA (Volume envelope).
• Pulsew. = This controls the Pulse Width for each oscillator. It is particularly useful when using the Pulse waveform.