Bugs: MIDI output, missing ledger lines

[CSÉCSYLászló]

I am setting out a piece available only in an original manuscript, which looks
like this one (only the text and the music is obfuscated, as I am not allowed to
give out the whole score). I have encountered some bugs while working on it; my
efforts are accessible at
http://frugalware.org/~boobaa/stuff/lvd-sample.{ly,midi,pdf}

1. In the generated MIDI the TB part comes too early: in the middle of the
second repeat, instead of at the end of the third. Did I write it wrong in the
.ly? If yes, why is it good in the .pdf?

2. The ledger lines are missing from the first chord of TB. This looks clearly
like a lilypond bug, as I had not done anything with or against them.

3. Not really a bug, but interesting anyway: I have 18 "warning: clef `.notdef'
not found" messages while running the .ly through lilypond. Is there any other
way to effectively remove the clefs? And btw, how should I remove the TB staff
(only a clef) from the end of the second line of the .pdf? I see why is it
there, but how can it be removed? I should reproduce the original as close as it
is possible...

Thanks,
Boobaa
(frugalware maintainer of lilypond)