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Do guitar pedals draw guitar signal when there is no amp connected at their output?

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icydash

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Ok so this is kind of an odd question, but here it goes:

I'm trying to do something like this:
pedlas.jpg

So basically, my guitar signal is being routed both into the input of a guitar pedal (in series with a few other guitar pedals), and it's also being routed to the amp. It's hard to explain the reason I'm doing it this way, but trust me, this is what I have to do for a project.

Anyway, notice that the guitar pedals aren't connected to an amp at the output; they are left floating. Will the guitar signal that IS being routed to the amp be diminished in any noticeable way? Since the guitar pedals are "open" in terms of the guitar signal, do they act just like any other open circuit and have no effect on the signal? Or, will the op-amps and other things in the pedals cause some of my guitar signal to be drawn away / distort it somehow?
 

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So what is the end result? Would the guitar signal going to the amp just be less, or would it be distorted? What exactly would happen?

If the signal to the amp would be diminished, by how much?
 

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