Boss RCE-10 Digital Chorus Ensemble
"Adopting the LSI newly developed specifically for digital chorus, the Boss Digital Chorus Ensemble allows for extremely rich chorus sounds. Owing to the Boss special digital modulation, the RCE-10 can produce perfect chorus modulation which has been impossible by the analog modulation."
While the translation above of the original manual is pretty poor, the RCE-10 provides a beautifully lush 1980's voiced chorus. Controls include Pre-delay, Rate, Depth and an on board EQ.
These use a standard 9vDC Boss power supply (not included).