Effects Loop adds gain to signal when empty

CorOS Version: 1.x

Describe your issue:

I found that my effects loop would often clip the signal so experimented with plugging the Send directly into the Return with a single cable and without any effects. This loop also adds a noticeable amount of gain to the signal. This is true both when using Effects Loop 1 and 2.
Is this an issue with my QC or is it possible that I am doing something wrong?

Steps to reproduce your issue:

  1. Add FX Loop to empty patch and connect Send 1 directly to Return 1 with a single cable.
  2. Record a short Loop using Looper to make sure comparison is fair.
  3. Turn on and off the FX Loop and listen to the difference.

I expected this to happen:
When there are no pedals in the FX loop I would expect gain to stay at unity.

I have tried the following things:

  • I have tried FX Loop 2, which has this same problem.
  • Lowering the Send level to around -5dB seems to get the loop back to unity gain, but is this correct behavior?

I sent in a request to support about this a few months ago, they’re still working on it but have told me it is something they’re investigating. You aren’t crazy or doing anything wrong.

If memory serves to get as close to exactly unity as possible for me at least it was something like -4.6 on the sends and -.3 on the returns.

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