Stems and/or beams directions

[=?utf-7?q?David_Gonz+AOE-lez?=]

Hello, I started typesetting the first prelude of Well Tempered Klavier, and
for avoiding collisions beetween the stems and beams of two voices in the
right hand, I had to use forced beams, and specified directions of stems
also. Is there any way of avoiding all those things? It a lot o typesetting.
The file is attached to the mail.

Thanks

David

WTK1.pmx