Just wondering if this is possible or not, as in the M4L convolution reverb. Looking inside it seems to rely on resampling the buffer with a mysterious object bufresample~ but I can't seem to find any info on it or how it works?
Hmm.. I assumed it was in the library - it looks like it's unique for the live device, you're right it seems mysterious :-) Check in with Alex Harker, the developer of the externals - he's also quite active on these forums http://www.alexanderjharker.co.uk/Contact.html
bufresample~ was written for the device, but it is perfectly possible to use elsewhere. At this stage it is now possible to make that object publicly available, and write a help file for it.
If I remember correctly off the top of my head it will take a message (probably process) followed by an output buffer, then an input buffer, then I think a ratio for resampling, and finally a sample rate (in case the original is in a different sr). I can't easily check that right now as I am between computers, but it is something along those lines. If that doesn't seem right, or it isn't possible to figure out from the device then let me know and I'll look in more detail,
There is also a message to set up the resampling filter (which impacts quality and speed), but I forget what that is. The defaults sound OK I think. Internally the resampling uses a windowed sinc approach....
It's been quite a long time anyone replied now but i'm interested in this too !
I'm not very experimented on Max. I used multiconvolve~ to apply a 5 IR convolution on the 9 outputs of an HOA (High Order Ambisonics) spatialization system (externals by the CICM MSH Nord Paris 8). It works good but I want now make the decay time, size and eventually eq and damp variable in real time, as in the M4L Convolution Reverb Pro.
I tried some things, including play the IR edit it (time stretch, eq...) and record it in a new buffer but obviously it takes the time to record in the buffer, so it's not real time. I also search the web and Cycling' 74 forums for hours but I still don't know how to do.
It's for an exam so I really need to find a solution.
So I would be grateful if you can help me doing it :)