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Bad-Schemer syndrome


From: PMA
Subject: Bad-Schemer syndrome
Date: Thu, 3 Nov 2016 15:41:25 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.8.0

Hi LP Gurus!

I have a score (see "Original" below) full of note events
like "gs 3", whose duration is MEANT always to be realized
as *one triplet half-note*.

Original = {     gs 3      a 3    g 2       a 3 }
Replaced = { \TR gs    \TR a      g 2   \TR a }

So, I'm trying to concoct a function that, for any event
of original duration '3', will input the pitch name only
(reading from "Replaced") and embed that string in the
command "\tuplet 3/2 <pitch-name> 2".

TR =
#(define-music-function (parser location offset) (?????)
  #{
     \tuplet 3/2 offset 2
  #})

But I'm stymied trying to whittle its Scheme, especially
re two questions: what variable type will work for the
the define-line ending "(?????)" - "string" doesn't; and
what extra syntax might the "\tuplet..." command need to
handle the "offset" in its innards?

Hope this is clear.
Thanks in advance.
Pete




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