Typically to get true bypass with an indicator LED, you need a 3PDT. Sometimes these are hard to source, and even when found, quality can be less than perfect. To get around this you can use relays to control switching of your circuit, or you can use Joe Davidson’s LED trick. I’ve used this successfully and really love the simplicity and the fact that I can use parts I typically have on hand already as well.
Joe Davidson’s LED trick allows for using a SPDT switch, LED indicator, and still maintaining true bypass.
