Unexpected gain add when using plugins on Carla with jack2

[Tornoz]

Hi, I'm using Carla on top of jack2 to get some voice effects on my microphone. I use 3-4 plugins on a row (noise suppression, reverb, etc) and even though they are dry most of the time (I use OSC to activate them) I notice a significant gain addition when the audio stream pass through them.

Here is an example of me talking with all the plugins connected (set to dry) and then when I connect the input directly to the pulseaudio sink. You can notice a significant drop in gain : https://voca.ro/18W7eRgfr4SZ

I don't know which part of the stack is responsible (jack, calra, the plugins themselves?). The plugins are all dry so it should not be a particular plugin that drives the gain up.

[bluebell]

Sounds as if you mix the direct signal and the processed signal together,

[Tornoz]

Ah thank you very much, it wasn't exactly that but your message made me re-check the connections and I had a stereo signal going into mono that was doubling the gain