tc electronic SPECTRA COMP This is a compressor for bass. It has one knob for control, but you can use your smartphone to adjust the settings. There are various presets in TC's TonePrint app, and it outputs data via audio, which you then load from your bass pickup to change the settings. It's quite an interesting mechanism(^^) Currently, it's in the default state. As a bonus, I'll also include a pedal cap. I'm selling it because I no longer use the compressor. Thank you. - Model Name: SPECTRA COMP - Brand: tc electronic - Type: Compressor - Color: Blue - Accessories: With box