Hi, I'm sure there's a simple answer to this, but I've read the manual and it's still driving me crazy! I'm using Logic 9, although the following was also true for Logic 8... Say I've got 2 software instrument tracks. Each is assigned to a unique software instrument, say, 1) Piano part playing on EVP88 and 2) an ES1 synth part. I want to create a multi output instrument, let's say an EXS24, and re-assign the existing parts to that: track 1) Piano part should play on EXS24 midi channel 1 and output to multi out channel 1-2; track 2) Synth part plays on midi channel 2 and outputs to multi out channel 3-4. So I switch the I/O input slot for part 1 over to a EXS24 Multi Output instrument. I set up my Piano patch - it's fine, playing through outputs 1-2. Then I go to the mixer and click the + button on the first instruments channel strip. An aux channel appears as expected showing that it's for outputs 3-4. In EXS24 I'll set up my synth part to output onto channels 3-4. Testing within the instrument shows this is working correctly. But when I go back to my arrange page I need to assign track 2, the synth part, to the EXS24 midi channel 2. I right click on the track and choose Reassign track->Mixer->Software instrument-> but there's only one option for the EXS24 there which is the existing instrument I set up for part 1, the piano. If I choose this the two arrange tracks are tied, so I cannot switch midi channels on one without it affecting the other. If I try to assign the track direct to the Aux channel it does nothing as you would expect. Am I being stupid? Am I going about it all the wrong way? I have no problem setting up multi out instruments from scratch, but can't find a way to correctly reassign existing parts. The only workaround I can find involves creating new software instrument parts and manually moving all the midi parts over to this new track. It works but it's no good for quickly auditioning different instruments for a part. Thanks in advance for any help to save me from my headache!