guitar transposition down an octave

[Patrick Stanistreet]

I wrote the list earlier that I was converting my
lilypond 1.6.0 files to 2.3.8  (started with 2.2.0)
using convert-ly the form for midi transpose no
longer worked.

I tried transposition and it works ok and does not
affect the score output

I put in just ahead of the notes, dont know why
c works, I just tried various until it sounded right.

\transposition c