The Blackcap retains the analog tremolo side of the original and brings the highly functional digital tap side into the realm of harmonic tremolo.
Where it used to turn the volume up and down, it now fades into highs and lows.
Mixed in parallel or in series with the amplitude-modulating tremolo, it's a new aural experience.

An analog tremolo with rate, depth and volume controls
A harmonic digital tremolo with rate, depth and volume controls as well as tap tempo and five selectable waveforms
A series/parallel switch to run analog to digital or both side by side
Volume boost available on each side
Expression jack for external touch control
Ramp mode to increase or decrease speed by holding the tap button
Relay bypass switching
Requires a 2.1mm 9V negative center pin power adapter (not included).