the kmix will increase the memory use with no reason.
i use pulseaudio + alsa
and according to the highest memory use that i see.
the highest memory could use about 900MB.
is this my problem.
or you useless memory did not release.
and i guess it maybe when new connect to pulseaudio it will increase memory use.
but when disconnection. it did not release.
Yes, know issue (memory leak ).
*** This bug has been marked as a duplicate of bug 309464 ***