hi,
I never tried with two different tuners, just tv tuner && webcam , 2 webcams etc .... but I remember when I was still using the oss virmidi driver to route stuff back and forth I copied virmidi.o to virmidi1.o inserted both et voila I got more internal midi ports to route, might work aswell with tuner.o (untested)
cp tuner.o tuner1.o
insmod tuner.o <args to tell it to use tunertype> insmod tuner1.o <args to use the other tuner type>
that's an ugly hack /me knows, but then again it might work.
regards,
x