using 2 Macs for recording with GarageBand

Hi there,

I try to make quite complex recordings om my iMac 27-inch, Late 2012, 2,9 Ghz Intel Core i5, 12Gb RAM, 1600 Mhz DDR3 Mac OS SIERRA 10.12.6 with GarageBand 10.2.0. I want to put in real Drums without moving this Desktop iMac. So I made a setup in another room where I have an old MacBook 2,4 Mhz Intel Core 2 Duo, 4 GB RAM 667 Mhz DDR2 SDRAM MAC OS 10.7.5 with GarageBand '11 version 6.0.5.

The MacBook takes 7 channels of drums without problems, but both GarageBand versions are not compatible, so I can't load the lot (= recorded material) from my iMac into the MacBook; it wouldn't be powerfull enough anyway to take more than 16 channels! Possible solution that I tried out: make a temporary Pilot-mix to stereo on the iMac (apparently only possible in iTunes), put it on the MacBook and play and record the drums on that MacBook... After this, all the drumtracks should be put into the the iMac to make a proper mix. If I transfered these drumtracks to the iMac: I had to make them aiff in iTunes one by one, and transfer them one by one. That's not a problem, but the tracks are not automatically synchronised. Is there an easier way of transferring audio from individual audio-channels of a GarageBand-recording on one computer to another while keeping the synchronisation?

(BTW: Would LOGIC make the solution of my problem easier?)

Thanks for possible info!!!

Johan Vandendriessche