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Audible ticking is a common problem in modulation pedals of various types, including tremolos. There ARE cures for such things, but whether any of them are feasible would depend onwhether the pedal is surface mount or not.
 

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The standard (though not absolutely universal) LFO starts off with a square wave, which is then "stretched" out with some lag into a triangle wave. Producing the initial square wave results in a sudden draw of current from the overall circuit. That sudden repetitive "gimme" is what we hear as the ticking. It can be solved by using low-current op-amps for the LFO, and by "decoupling" the LFO circuit from the rest of the circuit, especially the audio path. Unfortunately, if a company has decided to use, say, a quad op-amp to save on space and costs, with two of the internal op-amp sections used for the LFO and the remaining two used for the audio path, there is no way accomplish any of the "cures" listed.

Boss implemented a clever solution to this problem in their BF-2 flanger pedal. They added two parts to the LFO, such that it starts out with a trapezoidal, rather than square wave. By adding just the teensiest of lag to the rise and fall of the initial square, the ticking disappears.
 
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