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Author Topic: Different pitch from Genesis noise channel?  (Read 2448 times)

Offline Baka94

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Different pitch from Genesis noise channel?
« on: July 19, 2016, 07:16:52 pm »
Is is possible to get different pitches out of the noise channel? According to the manual it should be, but I can't figure out how. The 20xy effect doesn't seem to do anything and the noise mode macro seems to work sometimes and sometimes it doesn't. Like, sometimes when it's at a certain value it gives the same pitch from all notes. When I change it to something else and back it sometimes might give different pitches from the keyboard. If I now set any notes they will all play as same pitch regardless of sounding different pitch when I was placing the notes.
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Offline mihaelkyeah

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Different pitch from Genesis noise channel?
« Reply #1 on: July 20, 2016, 12:13:10 am »
It is possible.

In 20xy, y controls the white noise / periodic noise mode (periodic noise can be used as a bass), and x controls the channel 3+4 usage in the PSG - this means that if the noise channel is capable of using an ampler pitch range, then it also makes use of the 3rd square wave channel for being able to use a chromatic pitch range.

2000 - periodic noise, limited pitch.
2001 - white noise, limited pitch.
2010 - periodic noise, chromatic pitch.
2011 - white noise, chromatic pitch.

EDIT: from what I had understood at first, the third square wave channel was supposedly deactivated when you used the special noise mode in the noise channel; but then I made this taste, and it does something a little different than that; apparently, both can play at the same time if the notes are triggered simultaneously, but the pitch of the notes playing in the channel 3 depend on the pitch of the notes playing in the noise channel.
Unless that's not meant to happen and I incidentally found a bug.

But the noise channel behaviour has always been as I had described earlier, with the 20xy usage.
« Last Edit: July 20, 2016, 12:19:03 am by mihaelkyeah »

Offline marcb0t

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Different pitch from Genesis noise channel?
« Reply #2 on: July 20, 2016, 03:33:03 am »
It is possible.

In 20xy, y controls the white noise / periodic noise mode (periodic noise can be used as a bass), and x controls the channel 3+4 usage in the PSG - this means that if the noise channel is capable of using an ampler pitch range, then it also makes use of the 3rd square wave channel for being able to use a chromatic pitch range.

2000 - periodic noise, limited pitch.
2001 - white noise, limited pitch.
2010 - periodic noise, chromatic pitch.
2011 - white noise, chromatic pitch.

EDIT: from what I had understood at first, the third square wave channel was supposedly deactivated when you used the special noise mode in the noise channel; but then I made this taste, and it does something a little different than that; apparently, both can play at the same time if the notes are triggered simultaneously, but the pitch of the notes playing in the channel 3 depend on the pitch of the notes playing in the noise channel.
Unless that's not meant to happen and I incidentally found a bug.

But the noise channel behaviour has always been as I had described earlier, with the 20xy usage.
Nope, everything you said is correct. This is exactly how the PSG channels 3 and 4 behave when the noise is in "periodic" mode.

The pitch of channel 3 will always be the same note as the pitch in the noise channels, except 2 octaves higher. There are ways to use this to your advantage, but generally, people will silence the volume of channel 3 when Channel 4 is making the chromatically pitched noise sounds.

It is also possible to do some pitch sliding with the noise channel by putting in 1xx, 2xx, or 3xx commands into channel 3, while chromatic noise is activated.

Just play around with it a bit!