The article upon which music stands or falls is tap tempo. The Luther Tap Tremolo allows you to hammer out pure analog modulation with normal and harmonic modes, selectable waveforms, six tap multipliers, and a tap in/out jack for syncing with other pedals.

Need more information? Read the manual here.

Power requirements: 9V DC center negative, 94mA
Measurements: 4.7" x 3.6" x 1.5"