Thank you for viewing. This product is the KORG Nu:tekt TR-S. I purchased it new around last summer as a measure against a Jazz Chorus, 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 got a good feeling by placing it directly after the guitar, and it transformed even the JC120 into a tube amplifier. The texture changes so much that various people have complimented the sound. If you are having trouble with Jazz Chorus, please try it. Of course, it is fully functional. Also, please understand that this product is a used item and we will not accept returns or exchanges. Features ■ Recreates the behavior and SAG of a tube power amplifier with Nutube The circuit configuration unique to Nutube, which makes the vacuum tube itself compress. In all situations such as transistor amplifiers and DTM, it recreates the SAG (compression feel), which is the behavior of a tube power amplifier, 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 the sound. Since a natural compression effect can be obtained, it can also be used for instruments other than guitars.