fdfbff3999
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.
39 lines
1.6 KiB
Markdown
39 lines
1.6 KiB
Markdown
# Atari Lynx instrument editor
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Atari Lynx instrument editor consists of two tabs: Sample and Macros.
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## Sample
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for sample settings, see [the Sample instrument editor](sample.md).
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the only differences are the lack of an "Use wavetable" option, and the presence of a "Use sample" one.
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note that using samples on Lynx is CPU expensive!
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## Macros
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- **Volume**: volume sequence.
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- **Arpeggio**: pitch sequence.
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- **Duty/Int**: bit pattern for LFSR taps and integration.
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- **Panning (left)**: output level for left channel.
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- **Panning (right)**: output level for right channel.
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- **Pitch**: fine pitch.
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- **Phase Reset**: trigger restart of waveform/LFSR reset.
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## audio generation description
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Atari Lynx generates sound using a 12-bit linear feedback shift register with configurable tap. nine separate bits can be enabled to be the source of feedback: 0, 1, 2, 3, 4, 5, 7, 10 and 11. to generate _any_ sound at least one bit _must_ be enabled.
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### square wave
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the LFSR is shifted at the rate define by sound pitch and generates square wave by setting channel output value to +volume or -volume, depending on the bit shifted in.
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### triangle wave
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alternatively when "int" bit is set sound wave is generated by adding or subtracting volume from output effectively producing triangle wave.
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#### how triangle wave works?
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hint: to obtain triangle set bits "int" and "11" in "Duty/Int" sequence and set volume to about 22.
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by enabling 11th tap bit the value shifted in is negated after 11 bit is shifted in hence the volume is added for 11 cycles and then subtracted for 11 cycles.
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