Alternative reverbs?

cbit · Joined: Dec 01, 2005 Posts: 35

I noticed that the three reverbs JCRev, NRev and PRCRev expose only a mix parameter. I was wondering: what are chuckists currently doing when they want a greater level of control over the reverbs they use in chuck (eg. damping, decay parameters etc)?

cbit · Joined: Dec 01, 2005 Posts: 35

I'm thinking then: I probably need to route audio out of chuck, through a reverb plugin in a DAW and then back into chuck if i want more parameter control than the built-in verb ugens offer.

Kassen · Posted: Mon Nov 02, 2009 9:27 am Post subject:

Radarsat1 did a port of Freeverb to ChucK UGen, I think. That was supposed to work but wasn't pushed into the main build. I'm not sure why, actually.

cbit · Joined: Dec 01, 2005 Posts: 35

Thanks, googling those terms lead me to this page: http://www.music.mcgill.ca/~sinclair/content/blog/faust2ck_a_faust_wrapper-generator_for_chuck_ugens

This should be enough information to get chuck compiled with freeverb at least when I can't put it off any longer Wink

Kassen · Posted: Mon Nov 02, 2009 3:45 pm Post subject:

Ah, yes, there it is.

I never minded the situation because I tend to use outboard spring-reberbs when producing and only really use the ChucK ones when livecoding. On those moments slapping on a extra LPF tends to do for me for tuning, but yes; that's a issue.

Right now the complete STK (Synthesis ToolKit, where we are borrowing the reverbs from) does have decay-time member functions for the reverbs. There has recently been talk of updating the version of the STK that we use, but the problem is that we don't use the current (older) version in a straight way and made changes to it to make it interact with the rest in a more ChucKian way. Ge said he'd look into updating; it's not yet clear how hard that would be.

You can, BTW, write a convolution reverb using LiSa. LiSa would hold a impulse response and you'd start one voice per sample with a voiceGain of the original signal. That would be a very short program and you get to be cool because you can say "I wrote a convolution reverb this afternoon" at the local pub but I'd fear for the cpu usage.

cbit · Joined: Dec 01, 2005 Posts: 35

Thanks again!

flowdesigner · Joined: Dec 15, 2009 Posts: 3 Location: chamonix

Is it difficult to build good reverbs from scratch in Chuck?

Is it possible to build a convolution reverb from scratch?

Kassen · Posted: Fri Dec 18, 2009 7:37 am Post subject:

flowdesigner · Joined: Dec 15, 2009 Posts: 3 Location: chamonix

Thank you,

Do you know if anyone actually have implemented a convolution reverb in Chuck and been able to play it?

Is it possible to render sounds that is to CPU expensive for real time?

Cheers!

Kassen · Posted: Fri Dec 18, 2009 5:55 pm Post subject:

I once wrote one, but never actually tested it. It's also based on LiSa and I later realised LiSa has a 200 voice limit so that would mean that using a single instance of LiSa you would be limited to IR's of 200 samples max. A bit short. I could write one that would use multiple LiSa's, I suppose.

You can render "offline" by starting ChucK using "chuck --silent". It won't generate audio out but it will still record wave files if told to do so.