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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