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furnace/doc/4-instrument/c64.md

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C64 SID instrument editor

C64 instrument editor consists of two tabs: one controlling various parameters of sound channels and macro tab containing seven macros:

C64

  • [Waveform] - allows selecting a waveform. NOTE: more than one waveform can be selected at once, logical AND mix of waves will be produced, with an exception of a noise waveform, it can't be mixed.
  • [Attack] - determines the rising time for the sound. The bigger the value, the slower the attack. (0-15 range)
  • [Decay]- Determines the diminishing time for the sound. The higher the value, the longer the decay. It's the initial amplitude decay rate. (0-15 range)
  • [Sustain] - Determines the diminishing time for the sound. The higher the value, the longer the decay. This is the long "tail" of the sound that continues as long as the key is depressed. (0-15 range)
  • [Release] - Determines the rate at which the sound disappears after KEY-OFF. The higher the value, the longer the release. (0-15 range)
  • [Ring Modulation] - enables the ring modulation affecting the instrument.
  • [Duty] - specifies the width of a pulse wave. (0-4095 range)
  • [Oscillator Sync] - enables the oscillator hard sync. As one oscillator finishes a cycle, it resets the period of another oscillator, forcing the latter to have the same base frequency. This can produce a harmonically rich sound, the timbre of which can be altered by varying the synced oscillator's frequency.
  • [Enable filter] - enables analogue filter affecting the instrument
  • [Initialize filter] - initializes the filter with the specified parameters:
  • [Cutoff] - defines the "intensity" of a filter, to put in in layman terms (0-2047 range)
  • [Resonance] - defines an additional controlled amplification of that cutoff frequency, creating a secondary peak forms and colors the original pitch. (0-15 range)
  • [Filter mode] - determined the filter mode NOTE: SID's filter is muliti-mode, you can mix different modes together (like low and high-pass filters at once) CH3-OFF disables the channel 3, for no reason whatsoever lmao
  • [Volume Macrio is a Cutoff macro] - turns a volume macro in a macros tab into a filter cutoff macro.
  • [Absolute Cutoff macro] - changes the behaviour of a cutoff macro from the old-style, compatible to much more define-able.
  • [Absolute Duty macro] - changes the behaviour of a duty cycle macro from the old-style, compatible to much more define-able.

Macros

  • [Volume/Cutoff] - volume sequence (WARNING: Volume sequence is global for ALL three channels!!)
  • [Arpeggio] - pitch sequence
  • [Duty cycle] - pulse duty cycle sequence
  • [Waveform] - select the waveform used by instrument
  • [Filter mode] - select the filter mode/sequence
  • [Resonance] - filter resonance sequence
  • [Special] - ring and oscillator sync selector