Stomp spst switches

[R.G. Keen]

If you're going to use stomp switches, you probably want to
do true bypass and have a status indicator as well. This isn't
possible to do simultaneously with only a DPDT switch, but 
if you add a JFET and a diode, it becomes possible. The 
alternative is a 3PDT switch, which is expensive and rare. 

You can read about the trick at http://www.eden.com/~keen 
as the (modestly named) Millenium Bypass. You might also read
the article on Bypass technology there at the same site.