Delay modules - what do you want/need?

Hmm, what problem is it giving you? Do you use it poly-phonically? Like in physical-modelling/string synthesis? For that you need a specialized delay that receives a Voice/Active pin/command otherwise the delay might be full of junk if SE suspends and then re-awakens a voice.


Yeah, a stereo delay sounds like a good idea, will add that to the list. P.S - a ping-pong delay is always first summed mono before being processed, it won't work otherwise. 

  A "1 time left, 2 times right etc etc" delay is usually done with a multi-tap delay, for L/R you'll need a stereo version or maybe just mono-in + output pan, it's pretty versatile that way, and less CPU to do it in a custom module than setting up individual delays to do it. That way you can do: Delay,Delay,Delay, delay or Delay, Delay, Delay, Delay or Delay, delay, Delay, delay. This would be totally doable. Will a 8 tap delay be enough?


Would also dig to make a simple Reverb module for the community someday, I can code a 'good enough for rock and roll' reverb, but the CPU use is still a tad high. The only reverb module that I know of was the DH one, which was a 'Schroeder'-type reverb, that I for one did not like very much, so the trick is to make a reverb that is at least better than the DH one but still with a reasonable amount of CPU usage. I've been playing around with the Keith Barr(RIP) loop-type reverbs, just built from CK modules and need to code an actual module for my new synth project, so maybe I can see if I can adapt that into a slim-version, that hopefully doesn't sound like crap or eats too much CPU...

Keith Barr Loop Reverb

  

If it gets stuck with polyphony, it's definitely a Voice/Active thing, not really a bug, it may be just that the native Delay2 was not designed to work with polyphony, this should be an easy fix, if that is indeed the problem.


And yip, with 8 taps equals 8 repetitions, to do 12 or 16 taps is trivial and would still be cheaper CPU-wise to do it in it's own module rather than separate delay modules. The only slight drawback is max delay time, should probably be 10 or 20 seconds or even more? With 8 taps and max 10 seconds delay maximum separation per tap is 10 seconds / 8 taps = 1.25 seconds max delay per tap. Also sleep-mode is directly related to max delay time, say max delay is 20 sec, if will have to check the buffer for 20 seconds to make sure it's empty before it can sleep.   

Consider a "pre-delay+delay" added, it's a good idea! 

For the other idea, it can be done but it is dangerous, multiple feedback paths can easily blow up, basically you're putting a bunch of flangers(comb-filters) in the feedback path...delays always have to satisfy a unitary condition(feedback less than 1), so you need some form of unitary/orthogonal matrix -> rotation, hadamard, householder etc. Depending on amount of feedback taps/times/matrix - it would sound like anything from a highly repetitive/resonant machine gun, to something mildly reverb-ish.

And yeah, sorry, for matrix I meant to say ->rotation matrix, though the angle of rotation would be fixed. Left/Right delays need to have different delays time for this to work. This is a nice way to combine stereo feedback and still achieve maximum feedback. Also, just summing Left and Right channels and then feeding it back would actually make the echos Mono! That is why I prefer the simple matrix approach.

 en.wikipedia.org/wiki/Rotation_matrix

 

hey Andrew! love your modules.
could you give me some insight into how your allpass delay module works?
I'd like to get a reverb vst i made working on mac, but i unfortunately can't use your allpass module.
is it simply a delay-allpass feedback loop? couldn't get the same smearing with 10+ allpasses.
thx!