RME Fireface 800 in 64 bit Problem

Using information helpfully provided by Kappy and The Hatter on this forum (see topic https://discussions.apple.com/thread/6854453?answerId=27751034022#27751034022&ac_cid=op123456 if interested) I found that I was able to get my Mac Pro (early 2008) 3,1 to boot in 64 bit mode, and that Logic Pro 9 could also be made to open and work in 64 bit mode.

I am currently using OSX 10.6.8 Snow Leopard, but am waiting for 10.8 Mountain Lion to be “delivered” (by email) so that I can use Arturia’s V Collection 4 and their Keylab 61 USB MIDI keyboard controller, both of which require Mountain Lion. V Collection 4 is 64 bit only, which is why I want to use 64 bit.

It all seems to work except my RME Fireface 800 interface, which is not recognised in 64 bit - red light on the FF800 unit and the associated software will not open. The FF800 works fine when I go back to 32 bit on the Mac Pro.

Does anyone here know about the issue with 64 bit and the RME Fireface 800 please? Maybe it just needs updated drivers? I have emailed RME and await their reply but it made sense to ask here as well.

Any help would be much appreciated.

Thanks

Steve

[By the way, I have checked, from very helpful people on this forum, that Mountain Lion is compatible with my Mac Pro, and that the Mac Pro does have 64 bit kernal]