Tremolo pedals should all have a tap tempo like this one, it's such a handy addition. The shape and wave knobs allow quite a lot of tonal options while remaining easy to use. Plus: true stereo ins and outs... basically, this is very capable but very sensible and intuitive, and it sounds majestic.

Model: Seymour Duncan Shape Shifter Stereo Tremolo
Made: USA, recent model
Type: stereo tremolo
Power: standard 9v supply
Switching: true bypass
Draw: 13mA approx
Equivalent new street price (approx): $449aud
Mods: velcro added
Accessories: no box or manual
Condition notes: used, no major marks, excellent condition

Controls
Wave: controls waveform of the effect
Shape: controls the way the attack of the effect kicks in/out
Depth: depth of the volume reduction
Rate: speed of the 'wobbles' or the tap ratio
Ratio/Rate toggle: controls whether the knob changes the subdivisions of the tap tempo on 'ratio' or the speed of the effect