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There are also a couple tiny instances of formatting, like [sic] in the Namco 163 doc (yes, it is now correctly formatted) and a couple labels that needed bold.
48 lines
3.3 KiB
Markdown
48 lines
3.3 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.
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- more than one waveform can be selected at once. in that case logical AND mix of waves will occur.
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- noise is an exception. it cannot be used with any of the other waveforms.
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- **Attack**: determines the rising time for the sound. the bigger the value, the slower the attack. (0 to 15).
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- **Decay**: determines the diminishing time for the sound. the higher the value, the longer the decay (0 to 15).
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- **Sustain**: sets the volume level at which the sound stops decaying and holds steady (0 to 15).
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- **Release**: determines the rate at which the sound fades out after note off. the higher the value, the longer the release (0 to 15).
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- **Duty**: specifies the width of a pulse wave (0 to 4095).
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- **Ring Modulation**: when enabled, the channel's output will be multiplied with the previous channel's.
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- **Oscillator Sync**: enables oscillator hard sync. as the previous channel's oscillator finishes a cycle, it resets the period of the channel's 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 synchronized oscillator's frequency.
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- **Enable filter**: when enabled, this instrument will go through the filter.
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- **Initialize filter**: initializes the filter with the specified parameters:
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- **Cutoff**: the filter's point in where frequencies are cut off (0 to 2047).
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- **Resonance**: amplifies or focuses on the cutoff frequency, creating a secondary peak forms and colors the original pitch (0 to 15).
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- **Filter mode**: sets the filter mode. you may pick one or more of the following:
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- **low**: a low-pass filter. the lower the cutoff, the darker the sound.
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- **high**: a high-pass filter. higher cutoff values result in a less "bassy" sound.
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- **band**: a band-pass filter. cutoff determines which part of the sound is heard (from bass to treble).
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- **ch3off**: mutes channel 3 when enabled. not sure why is this part of the chip's design, but it is.
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- **Volume Macro is Cutoff Macro**: turns the volume macro in the Macros tab into a filter cutoff macro.
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- volume control is global (affects entire chip output), hence the option.
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- **Absolute Cutoff Macro**: when enabled, the cutoff macro will go from 0 to 2047, and it will be absolute (in other words, control the cutoff directly rather than being relative).
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- **Absolute Duty Macro**: when enabled, the duty macro will go from 0 to 4095.
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- **Don't test before new note**: this option disables the one-tick hard reset and test bit before a new note.
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## Macros
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- **Volume**: volume sequence.
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- warning: volume sequence is global! this means it controls the chip's volume and therefore affects all channels.
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- this macro becomes **Cutoff** when the **Volume Macro is Cutoff Macro** option is enabled in the C64 tab.
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- **Arpeggio**: pitch sequence.
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- **Duty**: pulse width 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.
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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 is set, which mutes the channel.
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