Ubuntu – Routing Pulseaudio to JACK causes glitches

alsaaudio-jackjackpulseaudiosound

In these days I'm trying to play my guitar through my audio interface using guitarix and JACK and they work just fine.
The issue arrives when I also want to play spotify or youtube in the meantime. I'm trying to route Pulseaudio to jack executing these scripts after the startup on qjackctl:

pactl load-module module-jack-source;pactl load-module module-jack-sink

The connection works, but then the sound that I get from my speaker is just terrible, full of glitches and strange noises, it just isn't usable.

Am I doing something wrong? Should I tweak something? Is this setup usable for you?

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