SESSION 4: CREATING SPACE WITH DSP Spatial Post-Processing of Audio Recordings Jean-Marc Jot Creative Advanced Technology Center, Scotts Valley, CA, USA This paper reviews signal processing methods for improving the presentation of two-channel and multichannel recordings by spatial processing in consideration of the playback system. The goal is to enhance the listener’s experience by attempting to address limitations of the playback system or recording format, while preserving the original audio content as faithfully as possible. The approaches reviewed here include: (1) artificial reverberation, (2) virtualization of recordings for playback over headphones or two loudspeakers, and (3) up-mix or stereo widening of two-channel recordings for playback over two-channel or multichannel loudspeaker systems.