Line 6 GuitarPort XT 16 amp and cabinet models based on PODxt, 19 must-have Stompbox and Studio effects, Effects can be routed Pre- or Post- Amp MP3, WAV and Audio CD playback, Looping and real-time half-speed without changing pitch 24-bit converters &amp; 32-bit processing, Line level and headphone outputs, Ideal guitar front end for other recording software Metronome for practicing, Built-in chromatic tuner, Includes preset tone library