Hello Gerd
In your MS B-stock version, is installed the Organ Mixer board 24Mb, same version that have James.
The Organ mixer board is made for scanning 2 Fatar manuals and the TWO Jack pedals that you have on the back are used for the Sustain pedals, Upper and Lower manual, no possibility to use the Volume pedal.
For use the Sustain pedal and Volume pedal, you must upgrade to the new Mixer V5 ( same for James)
Also, on your Mixer board, the aftertouch is not working perfect because for a different soldered resist value on fatar scanning.
regards

[This message has been edited by LIONSTRACS (edited 04-01-2010).]