Python SIDChip

Python SID Chip is a Python class intended to represent the features and functions of a Commodore SID Chip, making it easier to generate the correct register data for an emulator ( such as SIDcog on the Parallax Propeller ) or for sending to a real chip.

Components

SIDVoice

Represents a single voice on a SID chip. Functional on its own, but mostly used as part of SIDChip to form a representation for the whole chip.

Properties

• frequency - Set the raw frequency of the SID voice
• duty_cycle - The the duty cycle of the pulse oscillator, half of the max value is a square wave
• noise - True/False - Enable the noise oscillator, this shouldn't be used in conjunction with any other oscillator
• sawtooth - True/False - Enable the sawtooth oscillator
• triangle - True/Flase - Enable the triangle oscillator
• test - True/False
• ring - True/False - Ring modulation with the voice below
• sync - True/False
• gate - True/False - Enable/Disable the voice, also triggers the ADS and R stages of the envelope
• attack - 0 to 15
• decay - 0 to 15
• sustain - 0 to 15
• release - 0 to 15

Methods

• adsr(attack, decay, sustain, release) - Set the envelope ADSR in one shot

• pitch_to_frequency(hz) - Set the raw SID freqency from a musical pitch in hz

• frequency_to_pitch - Get the musical pitch of the current raw SID frequency

• midi_to_frequency(midi_number) - Set the raw SID frequency from a MIDI note number

• frequency_to_midi - Get the MIDI note number of the current raw SID frequency

• get_regs - Return a list of the SID registers for just this voice

• set_regs(regs) - Set the voice properties from a list of registers

SIDFilter

Represents the SID chip filter.

• cutoff

• resonance

• external

• voice3

• voice2

• voice1

• mute3

• high_pass

• band_pass

• low_pass

• volume

SIDChip