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Buying a pedal to do this. the best pedal i can reccomend for this is the boss TR-2 http://www.bossus.com/gear/productdetails.php?ProductId=139 it is only made to give the tremolo effect so it will me more diverse than any on an amp, and you will be able to get the tremolo exactly as you want it. http://www.youtube.com/watch?v=sp77ueBkqS0 is a video of it in use. these cost around 1/2 the price of buying a new amp at £69 ($110)
i hope this helps.
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