acciaccatura stem direction

[irenicus]

Hi,
could someone help me with this: I have a polyphonic piece of music(2
voices), so basically voice #1=stems up, voice #2=stems down. Now I want
acciaccatura notes in voice #2 to have their stems pointing up. Is there any
way to redefine this behavior or do I have to explictitly put \stemup
\stemdown into each acciaccatura?

Thanks...
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