Let's design a tap tempo tremolo.

[Barcode80]

It should be normally open, and closing the switch grounds the tap pin. Are you sure your switch is NO?

yep, but i'll double check. I'm using a batch of momentaries I got in a salvaged MXR micro controller, and I think they were all normally open, but I'll double check.

[sevenisthenumber]

are the boards and chip sets still for sale?

[Taylor]

Yep, PCB thread is here:

http://www.diystompboxes.com/smfforum/index.php?topic=83423.0

I've also setup a website to make ordering easier:

http://musicpcb.com