This application simulates the acoustics of a room and reproduces the sound signals for the two ears of a virtual listener inside the room. Listening to these signals using headphones gives the impression of being inside the room at the position of the listener. Please note that without headphones connected to your iOS device, this app may lead to unpleasant feedback noise. When run for the first time, this application will install an Audio Unit v3 App Extension that can be used in various third party applications. The sound sources take their signals from the left and right input channels (coming from a microphone, Inter-App Audio, or the AUv3 host application) and can be moved in real time by dragging the loudspeaker symbols on the screen. The listener can be moved by dragging the head symbol. Alternatively, sliders can be used to set the positions (including along the vertical Z dimension), as well as source gains and the listener azimuth. The simulated acoustic environment can be chosen from three different rooms with different sizes. Current settings can be copied in a text format to and from the clipboard. The unique mirroring function lets you create a balanced stereo setup simply by pressing a button.