Hudson Lacerda <hfml@...> answered:
> I know that this is not intuitive, but, replace:
> # with \201
> and
> b with \202
>
> Examples:
> (E/G\201) (- 4 x 2 4 0 0) brac
> (E\202) (- x x 1 3 4 3) brac
>
> That is because abcm2ps replaces # and b for a code which is replaced
> with Postscript accidentals (the glyphs are generated by abcm2ps: they
> are not characters from the 'original' fonts).

Ah! Thank you -- I had not yet discovered that flats
would be a problem as well (and am not sure that I
would've twigged to the cause even so, though it seems
so obvious now that you've explained it).

[To anyone looking at the demo file I just posted:
changing sharps to \201 in the diagram definitions
section as explained here removes the need to change
'#' to '\043' in the tune body, which in turn does
away with the need to use abpp.]

This just got easier. Yay!

-- Glenn