Standard instrument editor

The instrument editor for NES consists of these macros:

Volume: volume.
Arpeggio: pitch in half-steps.
Duty: duty cycle and noise mode.
- pulse duty cycles:
  - 0: 12.5%
  - 1: 25%
  - 2: 50%
  - 3: 75%
- noise modes:
  - 0: long noise.
  - 1: short noise.
Panning: output for left and right channels.
Pitch: fine pitch.
Phase Reset: trigger restart of waveform.