> mount_cd9660 /dev/cd0 /cdrom (also cd0a)
> mount_cd9660: read only filesystem

This is because you are trying to mount a read only filesystem
as read-write.  I always do "mount -t cd9600 -o ro /dev/cd0a /cdrom"
instead.                                     ^^^^^

> Also, has anyone managed to get something more than a strange click from
> the loudspeaker? A simple beep would be really nice :-)

Strange. I usually get a beep, though I do get a click once in a while.

ken