Includes a paid promotion
https://cusackmusic.com/tap-a-whirl-v4-analog-tap-tempo-tremolo/
Tuner used: http://www.cherubtechnology.com/wst_905li
The world's first tap-tempo tremolo pedal, the Tap-A-Whirl, had to be discontinued due to part availability.
The particular obsolete vactrol we used was the heart of the pedal. We searched far and wide for a replacement, to no avail. We had to work with part vendors to produce a special component that could meet our specifications. Now, after much ado, the Tap-A-Whirl is back. The new component allows for even faster tempos than the original Tap-A-Whirl. While we were at it, we added some serious upgrades to the user interface and feature set. The Tap-A-Whirl V4 is the most advanced tap-tempo tremolo pedal known to man.