Midi settings for IAA + Core Midi - help

Thanks for the quick reply, the problem I find with IAA midi only is that I can only record ISymphonic onto the 1 channel that has iSymphonic selected. I would like to record many tracks using iSymphonic. If i use IAA Midi & Core Midi I can have a different instrument on each channel in iSymphonic and they assign to the different midi channels I have created in Music Studio.
This seems to work but I get red noteswhen I record over something I have already recorded. And they go onto several channels, not just the one I am recording on to. In the midi in/out part of the midi set up page I have selected (in descending order) ‘tracks, all, tracks, all’.
Does this help at all?
Your help is greatly appreciated, thank you.