EBS TremoLo Works perfectly. There is a small scratch near the input, but otherwise, it is in very clean condition. Comes with the box and manual. EBS is famous for its bass guitar effects, but this tremolo also supports "Mono→Stereo" and "Stereo→Stereo," so it can be used with other instruments. It has three waveforms, and the filter mode allows you to apply tremolo while leaving the low frequencies untouched, making it ideal for bass. The volume can also be adjusted with the internal trim pot.