Multiple controllers and AU plugins (or software instruments)

Question

Hello,
This is my situation: 4 students and 4 (electronic) pianos (that can send on different channels).
I also use Logic Pro 9.
Midi interface with 4 ports
I want these 4 students play together performing something like an orchestral score, ie piano 1(or controller 1) plays strings, piano 2 (controller 2) wood, piano 3 (...) brass and piano 4 (...) something like percussion.
Because I'm a classical piano teacher, I want those piano's sounds really like a flute or trumpet or... For that reason I have installed AU-plugin from Garritan and don't use GM instruments.. These Garritan instruments are also used in the notation programs Sibelius and Finale.
I ask this because of the following problem:
If you make a file of 4 tracks using these software instruments and you link each separate track to a midichannel (and make it record affordable) all the 4 tracks sound no matter if you play 1 piano or controller or 2 pianos or 3 or.... I want each controller gives only 1 sound, or, one controller for one midichannel and not that one controller gives (in my case) 4 sounds. To reach this, do I really have to program Logic environment and if so, is there somebody who wants to explain or to help me with this?
Thanks a lot,
PeKes

Answer 1

Hi
You seem to have missed 1 important step (or two):
Settings:Recording (MIDI)
Check the "Auto demix by channel if multitrack recording".
Make sure that you have assigned the 4 tracks to different MIDI channels in the Inspector Track Parameter box.
HTH
CCT