I recently bought an SSL Nucleus 2 and set it up as per their guide for S1. When I have the mackie control and extender selected in S1, I am unable to arm tracks to record (the button lights for what seems like a fraction of a second then unlights) I can monitor however it appears to be the buttons mapped to the channel controls on the Nucleus that are having this issue, I.e. Track select, cut, solo and arm.
Any ideas?