These powerful and sturdily constructed combos are equally suited for stage or studio use, and feature an XLR line output and a 4-channel USB recording interface. Also included are Boost circuits customized for each amp type, a dedicated Reverb section with six reverb types, 18 additional effects, an effects loop, a Power Amp input for using Catalyst as a powered speaker, MIDI capabilities, and power attenuation options for playing at any volume. The free Catalyst Edit app for desktop and mobile devices provides deep editing capabilities. Six original amplifiers ranging from pristine clean to modern high-gain, all crafted by the Line 6 sound design team employing our celebrated HX technology. Each amp features a custom Boost. Adjust the boost amount and switch the boost on/off using the dedicated Boost knob and button. Select one of six reverb types. Adjust the reverb amount and switch the reverb on/off using the dedicated Reverb knob and button. Choose from six types each of Modulation, Delay, and Pitch effects—all drawn from our celebrated HX and Legacy effects libraries. Insert external effects and other devices into your signal chain using the Effects Loop.