Static Z Software introduces Sound Control for the Mac. Sound Control enables users to easily and quickly change individual app volumes as well as selectively apply a system-wide EQ to each app audio. Implemented as a convenient Menu Bar of your Mac, users can easily tailor the sound of their Mac's audio to their specific taste or to properly calibrate to the frequency response of their speakers. Users can also add software and keyboard control to HDMI and other audio devices. Sound Control is $9.00 and can be downloaded from their website.
Application volume controls and system-wide EQ for Mac