It is possible to modify the direct out from post-fade to pre-fade by adjusting jumper settings as illustrated in the Block Diagrams in the User Guides.  (jumpers J4/J5/J6)

It is also possible to configure the pre-fade Aux options (pre-insert, pre-EQ, post-mute) with (jumpers J1/J2/J3/ J7/J8)

As these are discontinued models, the Service Manual and schematics are published online in the documents section of the product page.

If you are in any doubt about performing this procedure, please consult a service centre who will be able to carry the work out for you.