Controlling MIDI output and chords

[Chris Angelico]

Hi! Apologies for using the list for something that's probably clearly
described on page 32767 of the docs, but I've been searching around
and can't find it among the massive amounts of information there!! :)

I'm using Lilypond to create both MIDI and PDF scores. What I hope to
achieve is a printable score which has four-part piano (two on the
treble clef, two on the bass), lyrics in the middle, and chord names
across the top; and in the MIDI, I want the piano parts, the lyrics,
but not the chords.

So far, I have a .ly file which produces correct-looking PDF output,
but the MIDI has the chords as well. I'm guessing that it's probably
something along the lines of removing the Note_performer from the MIDI
output, but I tried that and it doesn't seem to work. Any advice would
be gratefully received!

As an alternative to actually suppressing the chords from the MIDI,
taking their volume down to nothing would also serve.

Thanks in advance!

ChrisA