35 lines
3 KiB
Markdown
35 lines
3 KiB
Markdown
# C64 SID instrument editor
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The C64 instrument editor consists of two tabs: "C64" to control various parameters of sound channels, and "Macros" containing several macros.
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## C64
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- **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.
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- **Attack**: determines the rising time for the sound. The bigger the value, the slower the attack. (0-15 range)
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- **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)
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- **Sustain**: Sets the volume level at which the sound stops decaying and holds steady. (0-15 range)
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- **Release**: Determines the rate at which the sound disappears after KEY-OFF. The higher the value, the longer the release. (0-15 range)
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- **Ring Modulation**: enables the ring modulation affecting the instrument.
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- **Duty**: specifies the width of a pulse wave. (0-4095 range)
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- **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.
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- **Enable filter**: enables analogue filter affecting the instrument
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- **Initialize filter**: initializes the filter with the specified parameters:
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- **Cutoff**: defines the "intensity" of a filter, to put in in layman terms (0-2047 range)
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- **Resonance**: defines an additional controlled amplification of that cutoff frequency, creating a secondary peak forms and colors the original pitch. (0-15 range)
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- **Filter mode**: determined the filter mode NOTE: SID's filter is multi-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
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- **Volume Macro is Cutoff Macro**: turns a volume macro in a macros tab into a filter cutoff macro.
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- **Absolute Cutoff Macro**: changes the behaviour of a cutoff macro from the old-style, compatible to much more define-able.
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- **Absolute Duty Macro**: changes the behaviour of a duty cycle macro from the old-style, compatible to much more definable.
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- **Don't test/gate before new note**: Don't reset the envelope to zero when a new note starts. (Read "Test/Gate" below for more info.)
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## Macros
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- **Volume**: volume sequence (WARNING: Volume sequence is global for ALL three channels!!)
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- **Arpeggio**: pitch sequence
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- **Duty**: pulse duty cycle sequence
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- **Waveform**: select the waveform used by instrument
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- **Pitch**: fine pitch
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- **Filter mode**: select the filter mode/sequence
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- **Resonance**: filter resonance sequence
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- **Special**: ring and oscillator sync selector
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- **Test/Gate**: When on, the TEST bit resets and locks Oscillator 1 at zero until cleared. The GATE bit controls Oscillator 1's envelope: Gate on runs through the envelope's attack, delay, and sustain; Gate off is envelope release. |