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HX Effects hum when using effects loop and channel switching


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Marshall JCM 2000 DSL 100 & HX Effects. 

When using channel select from HX with effects in effects loop or 4CM there is a very loud hum.  Unusable in this state. 

Using the marshall footswitch with 4CM is fine.  Have verified global settings and HX effects input settings as welll as loop settings on amp.  When using modulation effects the hum is in time with the modulation.  It's as if the amp switching is tied in with effects loop.


Any tips?

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