ISP Technologies Decimator Pro Rack G Stereo - guitar version with 3-channels (for use in stereo set-ups), Decimator noise reduction system with dynamic filter and downward expander, channel 1 with special Hi-Z input for direct connection of instruments and stomp boxes in front of amp, channel 2 & 3 for use in a stereo effects loop or between preamp, rack effects and stereo power amp, latest generation of NR technology does not affect the guitar tone. Dimensions: 19"/1U