Hi Rich, This indeed won't make any sound. The waveguide object of the physical modeling library in Faust is just 2 delay lines in parallel : it's just a simple waveguide without terminations. For a simple string example, have a look at the openString function: https://github.com/grame-cncm/faustlibraries/blob/master/physmodels.lib#L471
Cheers, Romain On Sat, Oct 10, 2020 at 4:05 AM Julius Smith <julius.sm...@gmail.com> wrote: > Hi Rich, > > I am not familiar with this code, but thanks for the pointers. > > You have the right idea. ma.SR/freq needs to equal the round-trip delay > up and down the waveguide, adding up all delay line lengths, all filter > delays, and the feedback delay from the Faust compiler (there's always at > least one sample of that in any closed loop). > > Cheers, > Julius > > On Fri, Oct 9, 2020 at 6:55 AM Rich Cochrane <rich.cochr...@bigi.org.uk> > wrote: > >> Hello, >> >> I'm trying to learn Faust's physical modeling features "by >> experimentation" so am blundering around a bit. >> >> I found the last example on this page comprehensible: "Waveguide-Strings >> in Faust": >> https://hvc.berlin/Sound_Synthesis/Physical_Modeling/physical-modeling-faust-examples/ >> >> I wanted to be able to play it with a keyboard. I thought this might work: >> >> segment(pos) = waveguide(nMax,n) >> with{ >> nMax = ma.SR/freq; >> n = pos * nMax; >> }; >> >> Where freq is the usual frequency value triggered by a MIDI keyboard. But >> the result is a long way out of tune. >> >> I tried "nMax = freq : pm.f2l : pm.l2s;" instead but this appears to have >> the same net effect -- at least, it's also out of tune. >> >> What's the proper way to do this? Or is this base code not the right >> starting point for this? >> >> Cheers, >> >> Rich >> >> >> _______________________________________________ >> Faudiostream-users mailing list >> Faudiostream-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/faudiostream-users >> > > > -- > "Anybody who knows all about nothing knows everything" -- Leonard Susskind > _______________________________________________ > Faudiostream-users mailing list > Faudiostream-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/faudiostream-users > -- Romain Michon +33 (0)7 67 39 72 40http://grame.fr/~michon
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