Jeanette, 

* Jeanette C. <julien@MAIL.UPB.DE> [2021-09-02 11:44]:
> Hey hey,
> I'd like to create a piano like instrument (for starters). Some research
> lead me to a paper about modelling a piano based on waveguides:
> https://quod.lib.umich.edu/i/icmc/bbp2372.1987.013/--modeling-piano-sound-using-waveguide-digital-filtering?rgn=main;view=fulltext
> The author basically works with one-dimensional bidirectional waveguides. I
> expect the work was based on general purpose programming language(s).
> 
> I ran into quite a few challenges starting out. waveguide1 with higher
> frequencies would quickly decay, far too fast. I experimented with different
> cutoff settings and, naturally, the feedback.
The pitch versus decay issue is already handled in the first paper by
Karplus&Strong, as is tuning issues (for high pitches, semitones can
amount to delay differences of less than one sample). You might want to
look there.

> Reading about waveguides with junctions and two delay lines, I wonder:
> following the above paper, should I model one string with two waveguide1
> opcodes partially feeding back into each other?
> 
> Or is there perhaps a newer or different approach to modelling a piano that
> is easier to implement in Csound?
Also check the work by Clayton Otey, 
http://large.stanford.edu/courses/2007/ph210/otey2/
which has some code here
https://github.com/claytonotey/qiano and a neat OteyPianoStrings class
in supercollider.

best, P

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