This sketch describes the Mixed Reality application ASR (Augmented Sound Reality) which uses the overlay of virtual images on the real world to support the placement of three dimensional sound sources. Our system allows to place sound sources in a virtual or real room with the advantage of feeling, seeing and hearing them. This implies a more intuitive and better feeling of space and 3D sound. Our main goal was to demonstrate how Augmented Reality can be used for placing 3D sound sources to enhance the impression and feeling of 3D sound. The ASR application shows how this could work in the future. Another objective of our work was to develop an AR interface (pen with marker), which allows the user to interact with the virtual objects in a very simple way. The users control the sound sources with the pen. The different sound sources are represented as 3D objects on the HMD and they can be freely positioned by the user. Moreover, the user can select a sound-type and place the sound source into the 3D space. This way several sound sources can be placed in the room and the user gets a very good impression of the behavior of sound sources in the room.