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furnace/doc/7-systems/vrc6.md

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Add VRC6 support 2 Pulse channels: - 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume. - Furnace support PCM playback in pulse channels with duty cycle ignore mode. Sawtooth: - nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic). VRC6 instrument: - 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels. Duty, PCM mode command and Duty macro affects for pulse channel only.
2022-03-27 16:06:56 +00:00
# Konami VRC6
lots of doc updates
2022-10-16 05:53:05 +00:00
the most popular expansion chip to the Famicom's sound system.
Add VRC6 support 2 Pulse channels: - 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume. - Furnace support PCM playback in pulse channels with duty cycle ignore mode. Sawtooth: - nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic). VRC6 instrument: - 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels. Duty, PCM mode command and Duty macro affects for pulse channel only.
2022-03-27 16:06:56 +00:00
typo fixes
2022-03-28 03:18:50 +00:00
the chip has 2 pulse wave channels and one sawtooth channel.
volume register is 4 bit for pulse wave and 6 bit for sawtooth, but sawtooth output is corrupted when volume register value is too high. because this register is actually an 8 bit accumulator, its output may wrap around.
Add VRC6 support 2 Pulse channels: - 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume. - Furnace support PCM playback in pulse channels with duty cycle ignore mode. Sawtooth: - nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic). VRC6 instrument: - 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels. Duty, PCM mode command and Duty macro affects for pulse channel only.
2022-03-27 16:06:56 +00:00
lots of doc updates
2022-10-16 05:53:05 +00:00
for that reason, the sawtooth channel has its own instrument type. setting volume macro and/or pattern editor volume setting too high (above 42/2A) may distort the waveform.
some docs improvemets
2022-04-08 20:59:51 +00:00
typo fixes
2022-03-28 03:18:50 +00:00
pulse wave duty cycle is 8-level. it can be ignored and it has potential for DAC at this case: volume register in this mode is DAC output and it can be PCM playback through this mode.
Furnace supports this routine for PCM playback, but it consumes a lot of CPU time in real hardware (even if conjunction with VRC6's integrated IRQ timer).
Add VRC6 support 2 Pulse channels: - 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume. - Furnace support PCM playback in pulse channels with duty cycle ignore mode. Sawtooth: - nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic). VRC6 instrument: - 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels. Duty, PCM mode command and Duty macro affects for pulse channel only.
2022-03-27 16:06:56 +00:00
# effects
typo fixes
2022-03-28 03:18:50 +00:00
these effects only are effective in the pulse channels.
Add VRC6 support 2 Pulse channels: - 8 level pulse duty cycle, DAC mode(just ignores duty cycle)/pulse wave mode, 4 bit volume. - Furnace support PCM playback in pulse channels with duty cycle ignore mode. Sawtooth: - nothing but 6 bit volume (8 bit accumulator in technically) and 12 bit frequency (periodic). VRC6 instrument: - 6 bit Volume macro for finer sawtooth volume handling, also 3 bit Duty cycle macro for pulse channels. Duty, PCM mode command and Duty macro affects for pulse channel only.
2022-03-27 16:06:56 +00:00
Lots of little cleanup. Trying for more consistency and clarity, especially for quick reference.
2023-06-25 07:05:30 +00:00
- `12xx`: **set duty cycle.** range is `0` to `7`.
discourage use of legacy sample mode
2023-08-05 08:45:00 +00:00
- `17xx`: **toggle LEGACY sample mode.**
- **this effect exists only for compatibility reasons! its use is NOT recommented. use Sample type instruments instead.**
Documentation stuff! New page for the effect list, updates to chanOsc, and links to instrument types from every "system" page.
2023-08-04 16:11:53 +00:00
# info
Teensy formatting change. None of these should be list items. It was a bad idea.
2023-08-04 16:38:05 +00:00
this chip uses the [VRC](../4-instrument/vrc6.md), [VRC (saw)](../4-instrument/vrc6.md), and [Generic Sample](../4-instrument/amiga.md) instrument editors.