Glad to hear Mork!
Just to emphasize what others have said....if you have any of your channels set to 10W and others set to 45 or 90W you will definitely hear a loud pop when footswitching between the "10W channel and the 45 or 90W channel. This is also true if you manually toggle between 10W to 45 or 90W mode in any channel. If you really dig the 10W mode (which I really do even for some live performances), you need to have all 3 channels set to 10W mode to avoid the loud popping which will otherwise occur.
You should not experience any "popping" while manually or footswitching between all 3 channels regardless of mode with any combination of channels set to 45 or 90W mode (at least I haven't), and this is mentioned in the user manual.
Great that you are enjoying your V......It is may favorite amp!