No,
The principle is valid for technics or midi sequencer files. You can have changes programmed either in each track, or in panel memories which can affect several tracks at once. You may have set an octave change in a track, but if the panel memory command is after that change, the octave will immediately revert back to the original setting cancelling your new setting, and you can hear no difference.
If the change is in panel memory no 4, just select panel memory no 4, and change the octave of the voice in the mixer, on page 5 in key shift as described above.
Then resave panel memory no 4.
Then resave the song.
You could memorise a R1/R2 octave switch change in the panel memory too, the advantage of the mixer is you can independantly set the octaves of R1 and R2 simultaneously.