hugo>>soft
Here you can find some nice freeware I wrote. Currently there are two Audio Unit plug-ins for the audio people.
StereoPan
Headphone
StereoPan gives you advanced control over stereo signals. It provides individual re-panning for both stereo channels, pre- and post-pan volume control and switchable pan laws.
 
Click the screenshot to download.
Headphone is useful for those who often have to use headphones while producing music. It simulates the acoustic effects that usually occur when sitting in front of two monitor speakers to lower some disadvantages of headphone use.
 
Click the screenshot to download.