formatting two-note tremolo's

[kristof]

hi,

this is the first time i'm trying to make a score in lilypond, so 
excuse me if i'm asking stupid questions of if i'm overlooking 
something obvious..

when i make a two note tremolo, with the flowing code:

                \repeat "tremolo" 16 {<cis\6>32 <d\5>32 }

it looks like in the attached tremolo.pdf.
now i would like to change the slope of the tremolo sign, and also to 
move the symbol down (so it is in between the notes) and make a bit 
more space between the notes and the sign.
after browsing a bit through the documentation, i thought something like

                \once \override StemTremolo #'slope = #0.3
                \once \override StemTremoloe #'X-extent = #5
                \once \override StemTremoloe #'Y-extent = #5
                \repeat "tremolo" 16 {<cis\6>32 <d\5>32 }

should change the appeareance of the tremolo, but that doesn't seem 
to make any difference..
is there a way to change the properties i want? and what am i doing 
wrong then in the above code?

the result i want to achieve is something like in the attached wanted.png

many thanks in advance,

Kristof


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