rotary selection switch

[numpty]

http://www.maplin.co.uk/search.aspx?MenuNo=490&MenuName=Rotary%20Switch&FromMenu=y&criteria=Rotary%20Switch&doy=24m10&worldid=3

I want to use the above as selector switch for selecting one from a number of distortion effects ( the wipers would be wired to the input / output jacks and the poles to the pcb boards in / outs with a dpdt footswitch for bypass. however I'm not sure whether the inputs for each effect should be grounded when not selected which would require another switch wafer i.e. a different switch.I'm i right in thinking that if the input isn't grounded the effect may be developing noise, but if its not selected it doesn't matter because its not connected to the output.

[GibsonGM]

if you're not having the output of any but 1 effect active at any one time, you won't get any noise from the other ckts 

Try it with just 2, maybe use jumpers, no bypass switch, I do that as a 'proof' before I commit to something like that...
Good luck!