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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
  . . .
  var kind: byte

  var operand: int
end class