furnace/doc/7-systems/esfm.md

ESS ESFM

an enhanced version of Yamaha's OPL3, adding many features which weren't present on the original chip, such as 4-op on all channels, coarse/fine detune, per-op panning, envelope delay, noise generator and advanced modulation routing (no more algorithms!).

the technology was present in many of ESS' sound cards (the ES1xxx series in particular).

effects

• 10xy: set AM depth.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is either 0 (1dB, shallow) or 1 (4.8dB, deep).
• 12xx: set operator 1 level.
• 13xx: set operator 2 level.
• 14xx: set operator 3 level.
• 15xx: set operator 4 level.
• 16xy: set multiplier of operator.
  • x is the operator (1-4).
  • y is the new MULT value..
• 17xy: set vibrato depth.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is either 0 (normal) or 1 (double).
• 19xx: set attack of all operators.
• 1Axx: set attack of operator 1.
• 1Bxx: set attack of operator 2.
• 1Cxx: set attack of operator 3.
• 1Dxx: set attack of operator 4.
• 20xy: set panning of operator 1.
  • x determines whether to output on left.
  • y determines whether to output on right.
• 21xy: set panning of operator 2.
  • x determines whether to output on left.
  • y determines whether to output on right.
• 22xy: set panning of operator 3.
  • x determines whether to output on left.
  • y determines whether to output on right.
• 23xy: set panning of operator 4.
  • x determines whether to output on left.
  • y determines whether to output on right.
• 24xy: set output level of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 25xy: set modulation input level of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 26xy: set envelope delay of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 27xx: set operator 4 noise mode.
  • 0: noise off
  • 1: square + noise
  • 2: ring mod from operator 3 + noise
  • 3: ring mod from operator 3 + double pitch modulation input
    • note: emulation issues. subject to change!
• 2Axy: set waveform of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 2Exx: enable envelope hard reset.
• 2Fxy: set fixed frequency block (octave).
  • x is the operator from 1 to 4.
  • y is the block/octave from 0 to 7.
• 3xyy: set fixed frequency f-num.
  • x contains operator number and high bits of f-num may be any of the following:
    • 0 to 3 for operator 1
    • 4 to 7 for operator 2
    • 8 to B for operator 3
    • C to F for operator 4
  • y are the lower bits of f-num.
• 40xx: set operator 1 detune.
• 41xx: set operator 1 detune.
• 42xx: set operator 1 detune.
• 43xx: set operator 1 detune.
• 50xy: set AM of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y determines whether AM is on.
• 51xy: set SL of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 52xy: set RR of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 53xy: set VIB of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y determines whether VIB is on.
• 54xy: set KSL of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y is the value.
• 55xy: set SUS of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y determines whether SUS is on.
• 56xx: set DR of all operators.
• 57xx: set DR of operator 1.
• 58xx: set DR of operator 2.
• 59xx: set DR of operator 3.
• 5Axx: set DR of operator 4.
• 5Bxy: set KSR of operator.
  • x is the operator from 1 to 4. a value of 0 means "all operators".
  • y determines whether KSR is on.

info

this chip uses the FM (ESFM) instrument editor.