The Behringer FCV100 is a dual-mode foot pedal. Featuring the ability to accommodate two mono or one stereo instrument(s) via its dual 1/4″ input jacks. Switch into Norm mode where you can control the volume of two individual instruments. While using CV mode on the FCV100 foot pedal you can control modulation and volume levels of other musical instruments. Simply by connecting Output 2 to the volume or modulation input of the instrument. Additionally, when Output 2 is in use, you can still use Input/Output 1 for controlling the volume on another instrument, similar to Norm mode.
Overall, the FCV100 is perfect for controlling the volume and modulation in your guitar rig.