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furnace/doc/4-instrument/pokey.md
Electric Keet fdfbff3999 De-capitalization of docs (and little typo fixes) 
There are also a couple tiny instances of formatting, like [sic] in the Namco 163 doc (yes, it is now correctly formatted) and a couple labels that needed bold.
2023-09-10 10:16:55 -07:00

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Atari POKEY instrument editor

the instrument editor for POKEY consists of these macros:

  • Volume: volume sequence.
  • Arpeggio: pitch sequence.
  • AUDCTL: audio control register sequence:
    • poly9: reduces size of LFSR. only on noise waveforms!
    • high1: runs channel 1 at 1.79MHz.
    • high3: runs channel 3 at 1.79MHz.
    • 16-bit 1+2: enables 16-bit frequency mode by combining channels 1 and 2.
    • 16-bit 3+4: enables 16-bit frequency mode by combining channels 3 and 4.
    • filter 1+3: applies a high-pass "filter" by combining channels 1 and 3.
    • filter 2+4: applies a high-pass "filter" by combining channels 2 and 4.
    • 15KHz: runs channels at 15KHz.
  • Waveform: wave selection sequence:
    • 0: harsh noise (poly5+17)
    • 1: square buzz (poly5)
    • 2: weird noise (poly4+5)
    • 3: square buzz (poly5)
    • 4: soft noise (poly17)
    • 5: square
    • 6: bass (poly4)
    • 7: buzz (poly4)
  • Pitch: fine pitch.