Carrie,
I don't record many midifiles, but I have seen that if I record a midifile on my Tyros in quick record mode and then load the saved midifile into Cubase (using the import midifile function) the program automatically splits the different channels. This enables me to edit the different tracks at will.
Apparently the Tyros (and the PSR3000) record "0" type midifiles (where all the tracks are recorded together).
I have never tried to record a song from my Tyros to my PC, though.
_________________________
Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.