The Volume Preset pedal is used to switch between a bypassed volume and a preset lower level. The knob works just like the volume knob on your guitar.
This is great for presetting a lower volume, for example for rhythm playing, and switching to your bypass level for lead parts or overdriving your amp.
The pedal includes a treble bleed circuit to get more uniform guitar tone from 1 to 10.
You can either put it in front of all your pedals to work as a master volume for your guitar, just in front of your drive pedals to work as another gain stage or in your effects loop at the end to work as a master volume.
This pedal is completely passive and needs no power to operate. The only power needed is for the LED