furnace/doc/4-instrument/ay8910.md

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# AY-3-8910 instrument editor
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AY-3-8910 instrument editor consists of these macros.
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- [Volume] - volume levels sequence
- [Arpeggio]- pitch sequence
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- [Noise Freq] - AY-3-8910 noise generator frequency sequence
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- [Waveform] - selector of sound type - square wave tone, noise or envelope generator
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- [Pitch] - fine pitch
- [Phase Reset] - trigger restart of waveform
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- [Envelope] - allows shaping an envelope
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- [AutoEnv Num] - sets the envelope to the channel's frequency multiplied by numerator
- [AutoEnv Den] - sets the envelope to the channel's frequency multiplied by denominator