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.