Here a picture of a custom footswitch we made for a Fender Vibroking.
The problem with the amp’s stock footswitch is that there are no LEDs on it to indicate which functions have been activated, so we built a footswitch with LED indicators for each feature. The LEDs can be powered either from a battery or an external 9V supply.
We have an in house engraver, which makes the switch look a lot more professional at little extra cost.
We also chose super bright red and blue LEDs, fortuitously as it happens as I subsequently found out the customer was one of 8% of men with red/green colour blindness.