I am selling a used Yamaha R100 Reverb Processor - 1/2 rack Stereo Reverb and Delay effects processor. It is from 1987.  It has tweakable parameters and lots of user preset slots, perfect for a guitar amp or in a keyboard/PA rig.  Simple to program and can accept MIDI info (via MIDI in jack), footswitchable bypass, 12V adapter included.  What you see in the photos is what you will receive. If you have any questions please ask.