Switch Volume Pot resistance

[Triffid]

So along the same lines as my last post...
http://www.diystompboxes.com/sboxforum/viewtopic.php?t=29220&start=0&postdays=0&postorder=asc&highlight=

I am using a dpst switch to toggle both resistors  to switch my 500K volume pot to 100K and back as i want.  It sounds good to me both ways (switch on or off) but I don't know if I am messing with the ouput load or impedance in a negative way... it is a fuzz face by the way.   Anyone got any ideas there?

Thanks in advance