Reset VRC6 Phase

[lindarthebard]

https://wiki.nesdev.com/w/index.php/VRC6_audio#Pulse_Channels There's a way to reset the phase of a VRC6 pulse channel. I would very much like to be able to do that in order to create repeatable phase effects between the two pulse channels. Currently the phase doesn't reset between notes, so the phase gradually drifts, meaning the phasing effect is unpredictable on successive repetitions.

[nyanpasu64]

If I ever get around to doing this, do you need this within 0CC only, or for NSF export too? The latter will be more difficult for me to deliver.

[lindarthebard]

0cc for now, but NSF export would be great. Thanks!

On Fri, May 18, 2018, 03:22 jimbo1qaz, notifications@github.com wrote:

do you need this within 0CC only, or for NSF export too?

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[todidodido]

Oh, that would be so cool if possible. You can make so much neat stuff with phasing, especially in the lower register. That's how you make "reese" bass for example.

[nyanpasu64]

oh, 2 people want this? I may implement it sooner rather than later.

[nyanpasu64]

unfinished https://github.com/jimbo1qaz/0CC-FamiTracker/pull/81 ......

[nyanpasu64]

https://wiki.nesdev.com/w/index.php/VRC6_audio#Pulse_Channels

When the channel is disabled by clearing the E bit, output is forced to 0, and the duty cycle is immediately reset and halted; it will resume from the beginning when E is once again set. Thus it is possible to reset phase by clearing and immediately setting E.

I tried that, but it seems FT's emulation doesn't handle that behavior or something... Will continue investigating (while I have time).

[nyanpasu64]

Fixed VRC6 phase reset, implementation based off nsfplay code.

Can you test the build at https://ci.appveyor.com/api/buildjobs/hf0flkt0nf345jsk/artifacts/Release%2Fj0CC-PR81-phase-reset-build59.exe ?

• Test to make sure there are no behavioral changes with keyboard input?
• I added a new path for character-level input (not keycode-level input), passing through the same input functions (refactored to distinguish between keycodes and characters).
  • This is since = key varies by keyboard layout and should be handled at the character level. But "clear" and "repeat" are bound at the key level.

Phase reset is =00 and only supported on VRC6. Right now, =xx (where xx is not 0) shows up as red, but still performs phase reset. Should I change it to become a no-op effect?

[nyanpasu64]

hello?

[nyanpasu64]

Fixed in https://github.com/jimbo1qaz/0CC-FamiTracker/pull/81