My doubler bloc doesn’t do anything no matter the source I choose. I’ve read on Reddit you need to run it in stereo. Is it right and if so how do I route it ?
I’m using the QC through my audio interface and not as my audio interface
Are you running stereo into your interface? Do other stereo blocks sound stereo? I put the doubler toward the end of the chain and it definitely widens the sound. How’s it sound through headphones? Can you post a pic of your preset and tell us how your cabling is from your QC to your interface? I’m sure it’s just user error, but we can assist with that 
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No, I don’t run the QC in stereo. The QC is plugged to the interface from the out1/L to the front input of my Scarlett 2I2 that’s all. The two speaker are plugged to the L and R line output of the interface.
Now I’ve tried using headphone (which I never did before) and yes the doubler works this way. What do I have to do to make it work through the speaker now ?
You need to run the QC in stereo plug both L&R into your Scarlett 2i2.
The doubler turns a mono signal into stereo to delay one side and create the doubling effect, it can’t be done in mono unfortunately
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I’ll try that thanks