The older the battery, the more pronounced the sag effect both in the depth of the drop and in recovery time. This can tend to soften the sound of distortion pedals and change the tone, frequency response and attack. In some cases, this sag almost sounds like a gentle form of compression. The VBat allows the guitarist to get the voltage sag of a used battery without the hassles of constantly depleting and replacing traditional batteries. The Voltage control sets the base output voltage between 6.5 and 9.5 volts.
Ratio adjusts the severity of the voltage sag in response to current demand.
Requires regulated 12-18 vdc input. It really works great on my Fulltone Clyde Wah. Originally I had a Fulltone Blackbox Jr. Power supply with sag pots on the outlets. But that power supply would not work with the Line 6 Pedals. Missed the sag in a huge way and then found this little unit.