Check the listing for details. XSONIC ULOOPER - Dedicated Looper For Guitar Amps. Condition: New. Listed at 202.07 USD. ULooper is the world's first dedicated looper pedal for guitar amplifiers such as Positive Grid Spark, Boss Katana, Yamaha THR, etc. and redefines the looping experience. Most common digital amplifiers do not have an FX loop interface, so traditional loopers must be connected via the guitar input. This means that if you record a clean loop and then switch to distortion for a solo, the clean loop will also be distorted. Unlike traditional loopers, the ULooper connects to the amplifier via USB, so the looped sound remains unchanged even if you change the amplifier's sounds and presets. In addition, the ULooper has a line output that allows the connection of external speakers without having to mute the amplifier's speakers, as is the case with the headphone output. All of our items have a 30-.