Back in stock. 4th edition. This is Ryoji Ikeda’s 1st CD for Touch. Released originally in 1996, a new version for the Millennium was released in 2000. +/- has a particular sonority whose quality is determined by one’s listening point in relation to the loudspeakers. Furthermore, the listener can experience a particular difference between speaker playback and headphone listening. The sound signals can be thought of in the same way as spotlights. Lastly, a high frequency sound is used that the listener only becomes aware of upon its disappearance.