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PowerNoise doc is now complete

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tildearrow 2024-01-28 13:22:04 -05:00
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doc/4-instrument/powernoise.md
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@ -24,7 +24,7 @@ the LFSR must be initialized before it can produce sound. the Load LFSR macro al
by default the LFSR is configured to produce square waves, by having a single tap in position 1 and an alternating LFSR pattern.
## Macros
## Macros (noise)
- **Volume**: volume sequence.
- **Arpeggio**: pitch sequence.
@ -47,4 +47,32 @@ this tab allows you to change the base octave - important when you have set a lo
this channel has its own instrument type, as it does not use LFSR-based synthesis but instead generates saw waves.
I will finish this section later...
it uses a custom algorithm which will be (roughly) described below.
the slope channel uses two "portions" - each with length, offset, invert and clip parameters.
the channel alternates between these portions as it is cycled.
on every cycle, the offset of the current portion is either added or subtracted into the accumulator (depending on the invert parameter), effectively behaving like a multiplier.
if the clip parameter is enabled, this will make sure the accumulator doesn't go past 0 or 127 (depending on the invert parameter, again). otherwise, the accumulator will be ANDed with 127.
once an amount of cycles set by the portion length parameter have elapsed, the channel switches into the other portion.
the current value of the accumulator is output.
## Macros (slope)
- **Volume**: volume sequence.
- **Arpeggio**: pitch sequence.
- **Panning (left)**: output level for left channel.
- **Panning (right)**: output level for right channel.
- **Pitch**: fine pitch.
- **Control**: channel settings:
- **clip A**: sets clip parameter of first portion.
- **clip B**: sets clip parameter of second portion.
- **reset A**: resets the first portion.
- **reset B**: resets the second portion.
- **invert A**: sets invert parameter of first portion.
- **invert B**: sets invert parameter of second portion.
- **Portion A Length**: sets the duration of the first portion.
- **Portion B Length**: sets the duration of the second portion.
- **Portion A Offset**: sets the accumulator speed of the first portion.
- **Portion B Offset**: sets the accumulator speed of the second portion.