Can't get 2nd controller keyboard to work

[christopher]

Hello everyone,

Not sure if this is the right section, but here goes:

I just now tried to add a second controller keybord to my setup.
I already had a Fatar keyboard and everything has been working fine.

I now added a Clavinova to my setup - connected it to my MTP AV (can see light on MIDI Channel flashiing when I hit a key) and added it in the AUDIO/MIDI Setup.

However, when I try to "test connection", it seems no data is being sent.
DP doesn't make a sound either.

When I switch MIDI ports on the MTP AV between the old Fatar and the Clavinova, the latter works, but the Fatar is not recognised. Switch it back, and the Fatar is working again.

MIDI Monito is not showing any activity, either. I'm stumped.

Anyone? Help would be greatly appreciated.