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Global envelope events

These commands populate Envelope #3 and #4 which are shared by all channels. Envelope #0, #1, and #2 are populated by IO_INSTRUMENT::ENVELOPES; each channel has its own three envelopes.

Any available Jamdac channel can be used to enqueue the global envelope events; it doesn't matter which one.

I/O definitions​

CLASS IO_AUDIO_EVENT # SIZE 5
  . . .
  # * 3  = LOAD GLOBAL ENVELOPE #3      OPERAND = ADDRESS OF IO_ENVELOPE
  #                                               OR NULL TO RESET
  # * 4  = LOAD GLOBAL ENVELOPE #4      OPERAND = ADDRESS OF IO_ENVELOPE
  #                                               OR NULL TO RESET
  # * 5  = TRIGGER GLOBAL ENVELOPE      OPERAND = #3 OR #4
  # * 6  = RELEASE GLOBAL ENVELOPE      OPERAND = #3 OR #4
  # * 7  = LOAD GLOBAL REVERB           OPERAND = ADDRESS OF IO_REVERB
  #                                               OR NULL TO RESET
  . . .
  VAR KIND: BYTE

  VAR OPERAND: INT
END CLASS