The Bad Stain Rainbow City Delay effect pedal is a perfect addition to anyone’s arsenal. The digital design circuitry gives the Rainbow City a superior sound and tone. The Rainbow city features a .22 caliber shell three way selection switch that offers three different types of reverb. Setting the switch in the up position to “Room” generates a cube style reverb. The middle position set to “Hall” has a rectangular reverb. Setting the switch to “Well” in the down position produces a cylinder type reverb. Each reverb setting can be adjusted using the “Mix” knob that controls the amount of delay in the mix, the “Tone” knob which controls the tone, and the center “Decay” switch that controls the decay. The Rainbow City is compatible with any 9 volt DC power supply (Not Included). However, we recommend using a Bad Stain 9 volt power supply because we make more money that way. If you’re not 100% satisfied with the BSNW Rainbow City Pedal, you should probably buy a different pedal.