automatic beam direction for multiple voices

[Vaclav Smilauer]

Hi everybody,

if I use \stemBoth for two voices on the same staff (\voiceOne, 
\voiceTwo), stem direction is determined by pitch only and results in 
many clashes.

Can \stemBoth be somehow extended, so that if there are two voices on 
staff, the higher one (\voiceOne here) gets (automatically) stems up and 
the other one (\voiceTwo) stems down?

For one voice on staff (meaning that the other voice has skips or has 
been translated to other staff or simply does not exist) \stemBoth 
behaves "correctly".

This would be very useful IMHO; it is that way I have seen all 3-voice 
pieces fugues for piano/organ typeset.

Thanks, Vaclav