Hi, Roman:
My Idea was to first write the notes in tenor clef so that I can check
if I did everything wright on an outprint. Afterwars I wanted to
transpose
everything with one command into a bass clef staff with appropriate
transposed notes in the bass clef staff, but that doesn't seem to
work this way.
Yes, it does! Here's all you need to do
1. Write everything in tenor clef, just like you want:
\tromboneNotes = \relative c' { \clef tenor a b c d e f g }
2. Look at the printed output (in tenor clef), and confirm that the
pitches are correct.
3. Convert (not "transpose"!!) to bass clef by simply changing the
clef command from "tenor" to "bass":
\tromboneNotes = \relative c' { \clef bass a b c d e f g }
Good luck,
Kieren.