musikinformatik/SuperDirt

superchip is way out of tune

cleary opened this issue · 2 comments

cleary commented

Not sure if by design, but it is unusable with other synths (and it makes a great bass synth imo).

d1 $ note "c" # s "superchip"

should yield a note somewhere near c4@261.7Hz

Instead, it's a very sharp a3@228.1Hz

telephon commented

Yes, it seems to be the freqtotone method of the AY ugen is not correct.

*freqtotone { |freq|
		// Approximate empirical...
		//^(109300 / (freq - 3.70727))
		^(110300 / (freq - 0.5))
	}

Here is a test:

(
Ndef(\x, { 
	var freq = AY.freqtotone(300);
	AY.ar(freq, freq, freq) * 0.1 
	
}).play;
)
Ndef(\x, { Saw.ar(300) * 0.1 }).play;

it would be really nice if you could find a way to tune it.

Here is the datasheet: https://www.cpcwiki.eu/index.php/Datasheet_AY-8913

telephon commented

I've moved the issue here: supercollider/sc3-plugins#348

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