My apologies if I'm doing this wrong.
I have managed to get a Yamaha MOXF8 working with the attached patch. Presumably also works with a MOXF6.
The new Yamaha MOXF6/8 are successors to the MOX6/8. Apart from things like new voices, a flash expansion port, and a different colour at the ends, they are pretty much identical in operation.
The MOXF has a USB ID of 0499:150f. So I needed to add a new quirks-table.h stanza for it, by copy-pasting the MOX one and changing he ID.
I haven't tested it to death or anything, but I am having no trouble recording and playing audio and midi.
Let me know if this patch is acceptable or of there is more that is needed from me.
Note, this patch is against Ubuntu Raring's 3.8.0 kernel, but it's a trivial patch.
Mick.