I'm not sure exactly how you want your wah-wah effect to appear, but for 
starters you can go here:

http://lilypond.org/doc/v2.13/Documentation/notation/the-feta-font#index-Feta-font

...to find the glyphs you need.  The ones you need are listed under "Script 
glyphs."  One is "stopped" (looks like '+') and the other is "flageolet" (looks 
like a small circle).  There is also "open" which looks like a small letter 
'o'.  I've normally seen the little circle (I'm a trombonist).  I don't know 
how to do this without experimenting with it but if you want '+O' I suppose you 
could create a script called 'wah' or something and combine them together 
side-by-side.  This would mean 'wah' on a single note.  If you wanted the 
effect to span two or more notes I think you should be able to put the '+' over 
one note, the 'o' over the other and put some sort of dotted/dashed spanner 
between them.

Sorry I can't be more specific at the moment but I hope this is helpful,

David


----- Original Message -----
From: "Stefan Thomas" <kontrapunktste...@googlemail.com>
To: "lilypond-user" <lilypond-user@gnu.org>
Sent: Sunday, December 27, 2009 5:51:19 AM GMT -05:00 US/Canada Eastern
Subject: Re: wah-wah-effect


Dear community, 
I've created a little image (with another program) to illustrate what I'm 
thinking of. 


2009/12/27 Stefan Thomas < kontrapunktste...@googlemail.com > 


Dear lilypond-users, 
does someone of You know, how to produce a proper notation for wah-wah effect 
for trumpet or trombone? 


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