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62 lines
2.6 KiB
Markdown
62 lines
2.6 KiB
Markdown
# SID2
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a fictional chip created by LTVA. the idea is to fix [SID](c64.md) flaws and add more features, but not too much.
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unlike SID, it has per-channel volume control, better ADSR envelope which doesn't have bugs, more waveform mixing modes and the ability to play tonal noise waves.
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each channel now has its own independent filter. filter cutoff and resonance ranges were extended, as well as the frequency; finally, the chip can hit a B-7 note with default clock speed!
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## effects
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- `10xx`: **change wave.** lower 4 bits specify the wave:
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- `bit 0`: triangle
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- `bit 1`: saw
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- `bit 2`: pulse
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- `bit 3`: noise
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- `11xx`: **set resonance.** `xx` may be a value between `00` and `FF`.
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- `12xx`: **set filter mode.** the following values are accepted:
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- `00`: filter off
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- `01`: low pass
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- `02`: band pass
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- `03`: low+band pass
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- `04`: high pass
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- `05`: band reject/stop/notch
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- `06`: high+band pass
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- `07`: all pass
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- `13xx`: **disable envelope reset for this channel.**
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- `14xy`: **reset cutoff**:
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- if `x` is not 0: on new note
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- if `y` is not 0: now
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- this effect is not necessary if the instrument's cutoff macro is absolute.
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- `15xy`: **reset duty cycle**:
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- if `x` is not 0: on new note
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- if `y` is not 0: now
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- this effect is not necessary if the instrument's duty macro is absolute.
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- `16xy`: **change additional parameters.**
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- `x` may be one of the following:
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- `0`: attack (`y` from `0` to `F`)
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- `1`: decay (`y` from `0` to `F`)
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- `2`: sustain (`y` from `0` to `F`)
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- `3`: release (`y` from `0` to `F`)
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- `4`: ring modulation (`y` is `0` or `1`)
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- `5`: oscillator sync (`y` is `0` or `1`)
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- `6`: filter mode (`y` is `0` to `7`)
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- `7`: waveform mix mode (`y` is `0` to `3`)
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- `8`: noise mode (`y` is `0` to `3`)
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- `9`: phase reset (`y` is a discarded parameter and does not matter)
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- `A`: envelope key on/key off (`y` is `0` (trigger envelope release) or `1` (restart envelope again))
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- `B`: filter on/off (`y` is `0` (disable filter) or `1` (enable filter))
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- `17xx`: **pulse width slide up.**
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- `xx` is speed. if it is `00`, the slide is stopped.
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- `18xx`: **pulse width slide down.**
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- `xx` is speed. if it is `00`, the slide is stopped.
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- `19xx`: **filter cutoff slide up.**
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- `xx` is speed. if it is `00`, the slide is stopped.
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- `1Axx`: **filter cutoff slide down.**
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- `xx` is speed. if it is `00`, the slide is stopped.
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- `3xxx`: **set duty cycle.** `xxx` range is `000` to `FFF`.
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- `4xxx`: **set cutoff.** `xxx` range is `000` to `FFF`.
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## info
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this chip uses the [SID2](../4-instrument/sid2.md) instrument editor.
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