[PD] [gbuzz~] -- band-limited pulse train

[Matt Barber]

As a followup to last week's post, I put together an abstraction that
works like csound's "gbuzz" opcode.  Quite a bit more cpu-hungry...
could maybe do with fewer options.  If anyone has any efficiency ideas
I'd welcome them -- the algebra is convoluted -- something using
[expr~] would make things work better maybe.  I did use [expr~] for
the one audio "pow" operation to make this mostly compatible.  Also
uses [abs~].


Matt
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