AlanRatcliffe
There's that, but it's also more convenient to use your feet. You can also do other things like the panning between amps we mentioned earlier, or panning between different effects chains. I often use one to change the balance between magnetic and piezo pickups.
Mr-M
Satriani, if you use OD pedals and place a VP after them, you can use the VP to control the VOLUME of the OD. i.e if you want to make your volume quieter for a particular part of a song or use it as a volume boost for solos.
If you use amp OD and have an effects loop, if you place the VP in the EFX loop, it has the same effect of controlling the volume level.
Using the volume knob on your guitar, which in terms of order is in front of your pedals or amp OD, just adjusts the AMOUNT of OD, NOT the VOLUME. i.e. roll back volume for less dirt/ cleaner sound, roll up for more dirt/ gain.
That explain it?
