NUX Mfx-10 Aux-in Guitar Multi-effects Pedal with 55 Effect Types 1.A total of 55 models, up to nine can be used simultaneously/2.19 classic amp and pedal models with A/B channel switching 3.Vintage 3-band passive EQ for every amp model/4.Parametric EQ with extra middle frequency sweep control for pedals 5.12 cabinet models provide two different modes for guitar amplifier or mixer/PA input 6.Built-in drum machine with CD quality PCM sounds/ 7.Up to 20 seconds phrase loop with sound on sound 8.The AUX IN jack makes it easy to practice along with MP3, CDs and other inputs/9.The expression pedal lets you adjust the volume or effects parameters in real time