T6W28 instrument editor

the instrument editor for T6W28 consists of these macros:

• Volume: volume sequence.
• Arpeggio: pitch sequence.
• Noise Type: noise type sequence:
• 0: short noise
• 1: long noise
• Panning (left): output level for left channel.
• Panning (right): output level for right channel.
• Pitch: fine pitch.
• Phase Reset: trigger restart of waveform.