That won't work due to the way that audio signals work. Plus, I don't know of any cable that goes from 1/4" TRS to USB-C. You need an audio interface, or an amp that you can throw a mic in front of.Has anyone been able to connect their electric (bass) guitar directly to the Mac via USBC and execute sound from GarageBand? Do I really need to purchase the usb interface adapter to connect my guitar?
You need an audio interface.