Successful 4.0 install on z50; issue playing mp3s

hi!

i installed netbsd-hpcmips 4.0 on a z50 which has the extra memory
card. i could not get the pbsdboot supplied with netbsd 4.0 to run
under wince on this z50, but hpcboot worked. now my z50 successfully
has compiled lots of software with pkgsrc. i thank all the developers
who have made netbsd so terrific!

a major issue i am experiencing is that when i tried to play an mp3
the music was recognizable, but there are lots of hesitations and wow
and flutter. for what it is worth, the problems seem significantly
worse using mpg321 compared to either madplay or sox (play), both of
which seem to work about equally poorly on my z50 here. the fractional
load figures displayed by top while playing the mp3 suggest that the
problems are not being caused by overloading. i found in the archives
for this list both reports of success and reports of failure playing
music on the z50 with different versions of netbsd-hpcmips.

has anyone been successful playing mp3s on a z50 using the generic
kernel supplied with netbsd-hpcmips 4.0? if yes, what player works for
you?

are there kernel options not enabled in generic that might be enabled
to play mp3s better?

i don't have one, but has anybody tried a pcmcia audio card, for
example the audigy 2 zs, on a z50 with hpcmips 4.0?

thanks again!

tom