I have extremely limited experience editing using the on-board editor (mainly minor tweaking). Wish I could be more helpful.
[snip - options deleted from a draft reply**]
Take a look at the Command Station OS2.0 addendum.
"Explode Tracks
This function takes multichannel data on the clipboard and divides it up by
MIDI channel over all existing tracks, mixing with any data already there.
Channel 1 will go to track 1, channel 2 to track 2, etc. This is the case even
if the track routings do not match. (i.e. if track 7 is assigned to channel 3)."
I haven't done this, but it seems to me maybe you could (maybe):
1. Copy the MultiA recording (so you preserve the original!!!) to another track.
2. Move it (from the copy!!!) to the clipboard.
3. Explode it to get the channels onto 16 tracks.
4a. Delete the tracks/channels you want to exclude, or
4b. Use a selective "COMBINE SELECTED TRACKS TO CLIPBOARD"
etc.
Again, I have not done this--ever!!! Maybe someone else here has experience with using the Clipboard.
WARNING: If it were me, I'd make several copies of the MultiA track (and probably back it up using e-loader!) just in case.
Steve
**I deleted some thoughts about options not involving the E-Mu sequencer's on-board editor, but if the editor does what you want, that might be quickest.
Hmmmmm. I am not sure if the clipboard commands use valuable write cycles in non-volatile RAM or if they only use short-term RAM. Maybe someone else knows. If write cycles are used extensively for clipboard processing, there are options to edit the data in a sequencer/DAW. Another option involves externally filtering the data on the way in to the E-Mu.