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Doc touch-ups.

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I think I know how that chunk of the TIA docs disappeared, but not how I missed it in double-checking the PR....
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Electric Keet 2024-08-27 14:16:03 -07:00 committed by tildearrow
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6
doc/1-intro/glossary.md
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@ -12,6 +12,8 @@
**asset**: an instrument, wavetable or sample.
**bit**: a single binary on-off value.
**bitbang**: to achieve PCM sound by sending a rapid stream of volume commands to a non-PCM channel.
**bitmask**: a set of bits which represent individual single-bit toggles or groups representing small numbers. these are explained fully in the [hexadecimal primer](hex.md).
@ -72,7 +74,7 @@
**LFO**: low frequency oscillator. a wave with a slow period (often below hearing range) used to alter other sounds.
**LFSR**: linear-feedback shift register. an algorithm of generating pseudo-random noise that loops, also known as "periodic noise". depending on the location of the two "taps" used, different lengths of noise loops are generated.
**LFSR**: linear-feedback shift register. a method to generate pseudo-random noise that loops, also known as "periodic noise". within a sequence of on-off bits, it does math to combine the bits at specified locations called "taps", then shifts the whole sequence and adds the resulting bit on the end, guaranteeing a different state for the next pass. depending on the locations of the taps, different lengths of noise loops are generated; for short loops, this will affect their tone.
**macro**: a sequence of values automatically applied while a note plays.
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**supersaw**: a sound made up of multiple saw waves at slightly different frequencies to achieve a chorusing effect.
**tap**: a specified bit location within an LFSR.
**tick rate**: the number of times per second that the sound engine moves forward. all notes and effects are quantized to this rate.
- this usually corresponds to the frame rate the system uses for video, approximately 60 for NTSC and 50 for PAL.

13
doc/7-systems/tia.md
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@ -31,13 +31,24 @@ Furnace isn't complete without this one...
a song can be exported to assembly code for use with the TIunA software driver for the Atari 2600. see [TIunA on GitHub](https://github.com/AYCEdemo/twin-tiuna) for explanations of the export options.
## chip config
the following options are available in the Chip Manager window:
- **Software pitch driver**: use TIunA, a software pitch driver similar to TIATune. it increases pitch precision by rapidly switching between two pitches.
- **Old pitch table**: use an older method to calculate pitch. only for compatibility.
- **Mixing mode**: changes mixing mode.
- **Mono**: normal output.
- **Mono (no distortion)**: process each channel separately to eliminate distortion.
- **Stereo**: output two channels on left and right.
- **PAL**: run slower blah blah blah
## info
this chip uses the [TIA](../4-instrument/tia.md) instrument editor.
the arp macro's fixed mode operates differently, writing the direct pitch to the chip. here's a list of pitches.
### shape 1
| pitch | NTSC | note | cent | PAL | note | cent