Two questions: slashes and rhythmic cues

[Stan Mulder]

I've read the archives and see people discussing this but not sure 
anything was decided. I'm writing a jazz lead sheet and need slashes 
with chords over them. It's the slashes that I'm having a problem with. 
I found that I could use the following:

\override NoteHead #'style = #'slash
\override Stem #'transparent = ##t
g4 g g g
g g g g

But when the parts are transposed the slashes move all over the place 
for the Bb and Eb instruments. Is there are way to keep the slash 
exactly on a certain note and ignore the transposition? Also, that 
symbol should not be a playable one. Is there a way to differentiate it 
from a repeat slash marking so as to not have it play in the midi output?



The second question regards rhythmic cues, smallish notes that would 
appear in or above the staff indicating rhythmic "hits" or "kicks", but 
again this would only indicate rhythm and not be a playable note in midi 
output. It should also not be transposable.

Stan