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42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
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# Ensoniq ES5506 (OTTO)
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Sample-based synthesis chip used in a bunch of Taito arcade machines and PC sound cards like Soundscape Elite. A variant of it was the heart of the well-known Gravis Ultrasound.
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it supports a whooping 32 channels of 16-bit PCM and:
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- Real time digital filters
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- Frequency interpolation
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- Loop start and stop positions for each voice (bidirectional and reverse looping)
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- Internal volume multiplication and stereo panning
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- Hardware support for envelopes
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# effects
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- `10xx`: set waveform.
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- `11xx`: set filter mode (0-3)
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- `120x`: set pause (bit 0). Pauses the sample until the bit is unset, where it will then resume where it left off.
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- `14xx`: set filter coefficient K1 low byte.
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- `15xx`: set filter coefficient K1 high byte.
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- `16xx`: set filter coefficient K2 low byte.
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- `17xx`: set filter coefficient K2 high byte.
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- `18xx`: set filter coefficient K1 slide up.
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- `19xx`: set filter coefficient K1 slide down.
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- `1Axx`: set filter coefficient K2 slide up.
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- `1Bxx`: set filter coefficient K2 slide down.
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- `20xx`: set envelope count.
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- `22xx`: set envelope left volume ramp.
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- `23xx`: set envelope right volume ramp.
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- `24xx`: set envelope filter coefficient K1 ramp.
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- `25xx`: set envelope filter coefficient K1 ramp (slower).
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- `26xx`: set envelope filter coefficient K2 ramp.
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- `27xx`: set envelope filter coefficient K2 ramp (slower).
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- `3xxx`: set coarse filter coefficient K1.
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- `4xxx`: set coarse filter coefficient K2.
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- `81xx`: set panning (left channel).
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- `82xx`: set panning (right channel).
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- `88xx`: set panning (rear channels).
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- `89xx`: set panning (rear left channel).
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- `8Axx`: set panning (rear right channel).
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- `9xxx`: set sample offset (x256).
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- `DFxx`: set sample playback direction.
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