I had the same problem with my creative xfi, but i solved it by changing the "default-sample-format" value in "daemon.conf". The standard value was "s16le" and when i changed it to "s24le" the whistle dissappeared.
I had the same problem with my creative xfi, but i solved it by changing the "default- sample- format" value in "daemon.conf".
The standard value was "s16le" and when i changed it to "s24le" the whistle dissappeared.