[PlanetCCRMA] snd-serial problems

[Crispin]

Hello all

as far as I understand the serial sound drivers are part of ALSA.  I'd
like to use the serial port as a second midi interface (as I have a
yamaha MU-50 with a 'to-host' connector).  However the only instructions
I can find are at:
http://www.alsa-project.org/~valentyn/Alsa-sound-mini-HOWTO-7.html

which say to:
setserial /dev/ttyS0 uart none
modprobe snd-serial

but this returns the error:
module snd-serial not found

Any advice?  The rest of ALSA is working fine...

Thanks in advance,

-- 
Crispin