The only piece of information I could find was roaringapps.com site, which states: doesn't work. Somebody has posted a note there that Motu kernel extension crashes the system. No more details there...
Edit: after writing the post above (it is morning here) I checked Motu site again and the following statement has been added to 10.8 compatibility:
Current versions of all MOTU software and hardware drivers appear to be compatible with Mountain Lion