i was wondering if anybody knows an osx tool/software that would let you run system audio (all sources) through a vst plugin? say you want apply a compressor to whatever you are listening to? thank you!
Audio Hijack Pro is another option. http://rogueamoeba.com/audiohijackpro/
Wiretap Studio should let you do that http://www.ambrosiasw.com/utilities/wiretap/
Or Jack, but you will need to use a plugin host of some kind.
Blue Cat Audio's Patchwork has a standalone version that allows you to stack any flavor of plugins between any input and outputs.