Hello Rob, sorry, I was wrong with placing my C24 problem in this group. But thanx a lot for your help, I will do the stuff at the following way: Mic or Guitar -> UA 2-610 -> 192 I/O. So I have it an 2 Input Channels in ProTools. But how can I got the SPL as "Insert" or "AUX-Effect" to my ProTools? Regards, Alex...