no have sound in my spark amp
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my spark amp turns on but my guitar or the backing tracks cannot be heard
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Same here. Look for comments on the web and you will see the same complaint. Mine did the same and now I have to wait for a replacement.
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Before this happened if I may ask were you getting heavy static or what sounded like a grounding issue. I myself get a loud hum in some amp selections and the the guitar will go silent, I have to turn it off and on again at the amps switch.
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It is possible that the grounding unit has a problem or you have installed it incorrectly
mapquest driving directions