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41 lines
1.9 KiB
Markdown
41 lines
1.9 KiB
Markdown
# 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 whopping 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.** values are `0` through `3`.
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- `120x`: **set pause (bit 0).** pauses the sample until the bit is unset; 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.** resets sample position to `xxx * 0x100`.
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- `DFxx`: **set sample playback direction.**
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