Thank you for viewing. This product is the KORG Nu:tekt TR-S. I purchased it new around last summer as a measure against Jazz Chorus amps, but I am selling it because I bought a tube amplifier. It is said to be good to place it before the amplifier, but personally, I found a good feeling when placed directly after the guitar, and it transformed even a JC120 into a tube amp. The texture changes so much that many people have complimented me on the sound quality. If you are having trouble with Jazz Chorus amps, please consider this. Of course, it is fully functional. Also, please understand that this product is a used item and that it is sold as-is, with no returns or exchanges. Features ■ Replicates the behavior and SAG of a tube power amp with Nutube The circuit configuration unique to Nutube, which makes the vacuum tube itself compress. In all situations, such as transistor amps and DTM, it reproduces the SAG (compression feel) of a tube power amp with Nutube. In addition to the four knobs on the panel, it is equipped with three trimmer knobs inside the cover on the top of the enclosure, allowing you to further refine your sound. Because it provides a natural compression effect, it can be used for instruments other than guitars.