Standard instrument editor

The instrument editor for NES and PSG (SMS, MSX, and such) consists of these macros:

Volume: volume.
Arpeggio: pitch in half-steps.
Duty: duty cycle and noise mode.
- NES noise modes:
  - 0: long noise.
  - 1: short noise.
- PSG noise modes:
  - 0: short noise, preset frequencies.
  - 1: long noise, preset frequencies.
  - 2: short noise, use channel 3 for frequency.
  - 3: long noise, use channel 3 for frequency.
Panning: output for left and right channels.
Pitch: fine pitch.
Phase Reset: trigger restart of waveform.