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es5506.md

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Ensoniq ES5506 (OTTO)

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.

it has a whopping 32 channels of 16-bit PCM and:

  • real time digital filters
  • linear interpolation
  • loop start and stop positions for each voice (bidirectional and reverse looping)
  • internal volume multiplication and stereo panning
  • hardware support for short envelopes

effects

  • 10xx: set waveform.
  • 11xx: set filter mode. values are 0 through 3.
  • 120x: set pause (bit 0). pauses the sample until the bit is unset; it will then resume where it left off.
  • 14xx: set filter coefficient K1 low byte.
  • 15xx: set filter coefficient K1 high byte.
  • 16xx: set filter coefficient K2 low byte.
  • 17xx: set filter coefficient K2 high byte.
  • 18xx: set filter coefficient K1 slide up.
  • 19xx: set filter coefficient K1 slide down.
  • 1Axx: set filter coefficient K2 slide up.
  • 1Bxx: set filter coefficient K2 slide down.
  • 20xx: set envelope count.
  • 22xx: set envelope left volume ramp.
  • 23xx: set envelope right volume ramp.
  • 24xx: set envelope filter coefficient K1 ramp.
  • 25xx: set envelope filter coefficient K1 ramp (slower).
  • 26xx: set envelope filter coefficient K2 ramp.
  • 27xx: set envelope filter coefficient K2 ramp (slower).
  • 3xxx: set coarse filter coefficient K1.
  • 4xxx: set coarse filter coefficient K2.
  • 81xx: set panning (left channel).
  • 82xx: set panning (right channel).
  • 88xx: set panning (rear channels).
  • 89xx: set panning (rear left channel).
  • 8Axx: set panning (rear right channel).
  • 9xxx: set sample offset.
    • resets sample position to xxx * 0x100.
  • DFxx: set sample playback direction.

info

this chip uses the ES5506 instrument editor.

chip config

the following options are available in the Chip Manager window:

  • Initial channel limit: sets how many channels are available for use. if reduced, output rate increases.
  • Volume scale: allows you to lower the overall volume to prevent clipping/distortion when using too many channels.
  • Amiga channel volumes: makes volume linear, from 0 to 64 (40 in hex). used in S3M, XM and IT import.
  • Amiga-like pitch: pretends to be an Amiga, with periodic slides. used in S3M, XM and IT import (the latter two when linear slides are disabled).
    • only effective when pitch linearity is None.