If you want a dotted eight note to have the duration of two
triplet eight notes, you want 3/4 * X quarter notes to be
the same as 2/3 quarter notes, which gives X= 2/3 /(3/4) = 8/9.
Similarly, to make a sixteenth note have the duration of a triplet
eight note, you want 1/4 * X quarter notes to be 1
Thanks for the answer supplied long ago for how to connect similar
noteheads of different voices. Once I got lilypond back up on my
computer it worked nicely.
Then, tonight, I came upon this to balance:
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