This sturdy and dependable unit allows you to connect the output of an electronic musical instrument or other audio source to the balanced input on a mixer. Alternatively, the ADP2 allows connection of an audio source to an instrument amplifier while simultaneously patching it to a channel on a mixer. It even gives you the ability to connect the speaker output of an instrument amplifier directly to the input of a mixer - especially desirable in the case of a tube guitar amp (speakers must also be connected).