DSP (au_mixer) plug-in DLL modules:

Module name                     Release date              DOS          Sources
Prologic surround v1.54.2       July 4. 2007.             MXPLSURD.ZIP MXPLSURS.ZIP 
Super EQ (tone control) v1.54   Nov 5. 2006.              MXSUPEQD.ZIP MXSUPEQS.ZIP