Yamaha YM2151 (OPM)

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Effects

• 10xx: set noise frequency of channel 8 operator 4. 00 disables noise while 01 to 20 enables it.
• 11xx: set feedback of channel.
• 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.
• 17xx: set LFO speed.
• 18xx: set LFO waveform.
  • 00: saw
  • 01: square
  • 02: triangle
  • 03: noise
• 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.
• 1Exx: set LFO AM depth.
• 1Fxx: set LFO PM depth.
• 30xx: enable envelope hard reset.
  • This works by inserting a quick release and tiny delay before a new note.
• 50xy: set AM of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y determines whether AM is on.
• 51xy: set SL of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y is the value.
• 52xy: set RR of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y is the value.
• 53xy: set DT of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y is the value:
    • 0: +0
    • 1: +1
    • 2: +2
    • 3: +3
    • 4: -0
    • 5: -3
    • 6: -2
    • 7: -1
• 54xy: set RS of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y is the value.
• 55xy: set DT2 of operator.
  • x is the operator (1-4). A value of 0 means “all operators”.
  • y is the value.
• 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.
• 5Bxx: set D2R/SR of all operators.
• 5Cxx: set D2R/SR of operator 1.
• 5Dxx: set D2R/SR of operator 2.
• 5Exx: set D2R/SR of operator 3.
• 5Fxx: set D2R/SR of operator 4.
• 60xy: set operator mask.
  • Enables or disables operators.
  • If x is 0, y ranges from 0 to F. It is a bitfield, so y is the sum of the active operators’ bits:
    • OP1 is +1, OP2 is +2, OP3 is +4, and OP4 is +8.
    • For example, having only OP2 and OP4 on would be 2 + 8 = 10, resulting in an xy value of 0A.
  • If x is 1 to 4, the effect targets that operator; y turns it off with a value of 0 and on with a value of 1.
    • For example, the effect 6031 enables OP3.
• 61xx: set algorithm (0 to 7).
• 62xx: set LFO FM depth (0 to 7).
• 63xx: set LFO AM depth (0 to 3).

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Instrument Editor

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Chip Configuration

• Broken pitch macro/slides: Due to an oversight, pitch slides were twice as fast in older versions of Furnace. This option exists for compatibility.