Why when I decode try to decode/convert 192/24 flac to 44.1/16 wav I get white noise (using the latest bassenc and bassmix)
I mean some kind of noise on background. At the same time when I convert that flac file easy cdda extractor for example I get clear from this noise audio file.
PS: I have uploaded original.flac+original_made_by_bass.wav+original_made_by_ezcdda.wav to http://ftp://ftp.un4seen.com/incoming/
Yep. The original file has a high pitch noise in the background, and that is sounding even worse in the BASSmix version due to aliasing. You can try adding the BASS_MIXER_FILTER flag to your BASS_Mixer_StreamAddChannel call to reduce that.
The next BASSmix release will provide control over the number of samples used in the windowed-sinc interpolation, which should generally eliminate the need for the additional FILTER option.