Hello Markus, and welcome
This will depend on the software version of your MX6000. If it was originally sold with a Beolink 1000, there should be no problems, but if you have a Beo4 version, it may be a little difficult... check the type sticker on the rear of your TV. There will be a text "SW x.x" somewhere, hopefully "1.something" in place of the x.x.
Or otherwise, just try first pressing "PICTURE" on the remote, and then either "<" or ">". If the stand turns, it should be as simple as using the remote to drive it into the position you'd like it to normally have, and then pressing STORE.
EDIT: On second thought, it probably needs STORE-PICTURE-STORE to memorize the position. That will memorize all the picture settings at the same time.
If the stand doesn't respond to PICTURE + </>, you probably have the later SW designed for a Beo4. If this is the case, just tell us and I think there is a way to do it even then.