MorphOS does not have Emu10k1 drivers in normal distribution (at
least on 1.4) so you'll need to download them on net.
http://www.lysator.liu.se/~lcs/files/ahi/beta/
ppc-morphos-ahiusr-5.10.lha
It has files EMU10KX and emu10kx.audio
copy EMU10KX to devs/audiomodes and emu10kx.audio to devs/ahi
after those.. (and reboot?) you'd ought to able to select Emu10k1 from
Ahi prefs.
http://somequicknotes.blogspot.com/index.html