[maxmsp] Re: comb~ and alternatives

>
> Non-math answer, the higher you make the last inlet of comb~/teeth~  
> the longer the ringing should be.

that's right. but the problem with [comb~] and [teeth~] is, that they  
use linear delay time interpolation instead of slightly more  
expensive cubic or allpass interpolation.
this becomes apparent if you set the delay time to non-integer  
multiples of the sample interval - which is most often the case.
this results in high frequency loss in the output signal, which is  
pretty audible if you work with high feedback settings.

if you set the delay time with a float (not a signal) teeth~, comb~  
and also tapin/tapout~ don't do sub-sample delay times at all.
so the ringing frequencies are out of tune.

don't know exactly what kevin's problem is with [comb~], but i would  
rather go with tapin~/tapout~ and set the delay time with a signal.
then again the highest possible pitch is limited by the sigvs.
but tapin/tapout's interpolation sounds much better than comb/teeth  
(still not perfect).
aha, and if you go for distinct pitches, make sure you set the delay  
time 1 sample shorter than the pitch period you want to obtain.

finally, i got a delay external somewhere on my disk that uses  
allpass-interpolation (osx only).
this is slightly more cpu intensive and not made for rapid delay time  
modulation, but gives you 'endless' ringing without
any unwanted high frequency loss. kevin, get back to me, if you want  
to try it.

volker.

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