Original dirty compressor about superdirt

[ahihi]

yeah, that could end up being the best option and surely would run the fastest. i have been meaning to learn SC plugin development anyway.. might be a few weeks till i have the time though.

[ahihi]

as per the Fb1 docs, that does not work:

What cannot / shouldn't be done (ar case considerations):

Writing ar UGens in func that produce a time-varying signal itself (e.g. SinOsc.ar, in contrast to SinOsc.kr and operator UGens like '+', '*' etc.) - instead, if such ar UGens aren't applied to data from inside func, they can be passed via Fb1's and func's 'in' arg. It remains the case of such ar UGens that should process data that is provided by func (e.g. letting the fb out modulate a parameter of a VarSaw.ar). This is currently not possible and I don't have a clear picture if and how it would be possible at all or if it would make much sense.

i do think the current version sounds good, but would like to match the original.

edit: i do also use Compander a lot, but the goal here was to reimplement the algorithm from Dirt ^^

[telephon]

The UGen is a control rate ugen (Select.kr) so it doesn't need Fb1 really.

Can't test it right now, but this should be about what is needed:

(
Ndef(\dirtComp, { |amount=1, speed=50|
	var input, max, env, n, prod;
	var ctrl;
	n =  2; //~dirt.numChannels;
	input = In.ar(0, n);
	ctrl = input[0];// maybe we want to multichannel expand or sum rathen than taking the first channel?

	max = ArrayMax.ar(input.abs);
	env = LocalIn.kr(n);
	env = env + (speed / SampleRate.ir); // needs fix: making it depend on the sample rate and on block size 
	prod = (ctrl * env).abs;
	env = Select.kr(prod > 1, [env, env/prod]);
	LocalOut.kr(env);
	ReplaceOut.ar(0, input * amount.linlin(0, 1, 1, env * 0.2));
}).play(
	group: RootNode(Server.default),
	addAction: \addToTail
);
)

It would be good if we could just add the Fb1 part of the library otherwise, yes!

[ahihi]

The UGen is a control rate ugen (Select.kr) so it doesn't need Fb1 really.

that is a mistake on my part. the original C code runs this conditional at audio rate, but i am not entirely sure how to achieve that here.

[telephon]

Ah I see, well, all you have to do is to use a Select.ar in the Fb1. But if it sounds good as it is now, maybe that is not necessary? Btw. have you checked the Compander UGen? (here is the source: https://github.com/supercollider/supercollider/blob/71d5d1841bc1b26a59560c6544f3996765f6ff63/server/plugins/FilterUGens.cpp#L3242). It may be similar, but I am not sure. Also there is a CompanderD, a slightly different one.

Just to be sure!

[telephon]

Another idea: What about writing the thing as a ugen plugin? We could add it to sc3plugins.

[telephon]

Most people say it is quite easy. You could take Compander as a starting point.