Tremolo pedal as a pwm

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Hi everyone!
I am new to this forum, hho and electronics in general.
I am picking it up pretty quick, but its best to assume i know nothing.

I need a pwm that can handle a 12v 3amp max power supply. I am only learning at the moment but i find it easier to learn if i just do it.
From my knowledge of music tech, i beleive that a pwm works in very much the same way as a tremolo pedal.
Is this true?
If so, would this suffice?

Belcat TRM-507 Tremolo Pedal at Gear4music.com
http://www.gear4music.com/Guitar-and-Bass/Belcat-TRM-507-Tremolo-Pedal/B74

Thanks in advance!
Electronoob
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