Here's what Coppersound say about the Dual Tap:
The CopperSound Dual Tap allows you to sync up two tap-tempo devices with one footswitch!
More control
There are a lot of pedals on the market with external expression capabilities, most prominently being external tap tempo(commonly found in the form of a ¼” jack). With the Dual Tap connected to the expression (often referred to as EXP) jack of a pedal, you now have control over the tempo/rate of that effect.
The Dual Tap really shines at syncing up the tempo on two separate pedals. Tapping in the tempo of a pedal can change often and dramatically, requiring direct access to the tempo switch. With the Dual Tap, you can leave your delay in the back row of your pedalboard, and keep easy access to the tap switch right up front.
Two forms of tap tempo
It’s worth remembering that not all pedals use the same method for setting tempo. The two most common forms are Normally Open(NO), and Normally Closed (NC). Boss is well known for using NC, whereas many other brands use NO. Consult the manufacturer to find out which is required. Inside the Dual Tap, you’ll find a DIP switch with two toggles, allowing you to set independent forms for each jack on the Dual Tap.
