Okay, it's because I was looking at https://guitarextended.wordpress.com/ and he was using JACK. Thanks for clarifying, it works now

Hi, I'm a complete Pd and audio engineering beginner trying to connect an electric guitar to my Macbook and process the signal to create some effects for a school project. I'm trying to use JACK for that purpose, but I searched the entire internet including this forum, and can't seem to figure out how to do it.

What I'm working with is:

• jack -> USB Behringer cable
• Pd 0.51.1
• JACK 1.9.16 installed with an installer from jackaudio.org and running the bundled Qjackctl
• macOS Catalina 10.15.6

When I run JACK in messages I can see that it recognizes the USB guitar interface C-Media USB Device:

In the connection graph I can only see these available:

Also while having JACK running, I go to MEDIA -> JACK in Pd and in the logs I get "Can't open Jack (it seems not to be installed)" error message.

I've also tried alternatives to JACK like Soundflowe or Blackhole, but don't understand how to use it to send the guitar signal to Pd or even how to send it to the speakers (is that even possible?).

My JACK settings look like this:

Any help would be greatly appreciated!