AY8930 instrument editor

AY8930 instrument editor consists of 10 macros.

[Volume] - volume levels sequence
[Arpeggio]- pitch sequence
[Noise frequency] - AY8930 noise generator frequency sequence
[Waveform] - selector of sound type - pulse wave tone, noise or envelope generator
[Duty cycle] - duty cycle of a pulse wave sequence
[Envelope] - allows shaping an envelope
[Auto envelope numerator] - sets the envelope to the channel's frequency multiplied by numerator
[Auto envelope denominator] - sets the envelope to the channel's frequency multiplied by denominator
[Noise AND mask] - alters the shape/frequency of the noise generator, allowing to produce various interesting sound effects and even PWM phasing
[Noise OR mask] - see above