ledvedder5150 Posted November 19, 2020 Share Posted November 19, 2020 Hi guys, I've been using my HXFX in 4cm to my Runt 20 with no issues. Tonight, I decided to give the ext amp a try to change channels on the Runt. As soon as I plugged the cable from the HXFX ext amp jack to the Runt's footswitch jack, I started getting a hum. I'm assuming it's a ground loop? I tried switching the ground switch on the Runt, but still hums. This works perfectly fine on my DSL and 5153. Any ideas how to resolve it with the Runt? Quote Link to comment Share on other sites More sharing options...
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