Swamp Thang Thumping

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Swamp Thang Thumping

cns0270
Hi all,

I built the Swamp Thang a couple of years ago and it worked fine. Since then, it sat on the shelf for a year or so. I put it back on my board today and when I turn it on, it thumps through the speakers. As I turn the intensity knob it controls the volume of the thump. The effect still works and the thump isn't really audible when I play but as soon as I stop, there it is..

Any idea why it is now doing this? Thanks in advance for any advice.