sound.o unresolved modules problem

[Pollywog <pollywog@shadypond.com>]

I cannot yet get the commercial OSS-Linux drivers for 2.4.0 test kernel5 so I
decided to try compiling modules for my sound card (SB Vibra16).  The HOWTO's
are confusing, but I recompiled my kernel and I was able to load the sound.o
module.  I recompiled again, with sound.o and sb.o modules but now I get this:

lilypad:/home/pollywog#insmod sound
Using /lib/modules/2.4.0-test5/sound/sound.o
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
unregister_sound_mixer_R7afc9d8a
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
register_sound_dsp_R70189dea
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
register_sound_midi_R1f91aa12
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
unregister_sound_dsp_Rcd083b10
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
unregister_sound_special_R99c95fa5
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
register_sound_mixer_Rc056b591
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
register_sound_special_Rfbb45806
/lib/modules/2.4.0-test5/sound/sound.o: unresolved symbol
unregister_sound_midi_Rfdab6de3

Why was I able to load the module a while ago but not after recompiling the
kernel again- what is this unresolved symbols business anyway?

Should I just give up and wait for the updated OSS-Linux driver?  This is all
very confusing and the different HOWTO's seem to say different things.

--
Andrew