I have an external interface (Presonus Firestudio Project) that I have hooked up to my Mac and am using it with my studio monitors for all my audio needs. I have the Mac setup to use the interface as the default sound card and the volume controls are greyed out and in order to control the volume; I need to get up a use the physical knob on the interface.
Is there a program or something that I can setup so I can control the volume of the signal being sent to the interface with the normal buttons on the keyboard?