Here are a some of the top issues folks run into when using the FEliX
1. Effects loop insert not working
The effects loop insert is after the mixer, which means that if the output you are using is not set to 'MIX', the signal will not go to through your effects. Set the output(s) you're using to mix
2. No signal on channel 1 with an instrument plugged in
This is most commonly because the ch1 input is set to 'MIC' via the 'MIC/Line' switch next to the ch1 XLR input. Make sure this input is set to 'Line'.