NES instrument editor

the instrument editor for NES consists of these macros:

• Volume: volume sequence.
• Arpeggio: pitch sequence.
• Duty/Noise: 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
• Pitch: fine pitch.
• Phase Reset: trigger restart of waveform.