I am trying to run my electric guitar in garageband 11 but there is no options to modify the inputs/outputs to built

There is no option to modify the sound input/output to built-in input or built-in output.  I'm guessing the electric guitar is not being registered.  I am using a 1/8" mono -1/4" mono cable to go directly from the output jack on my electric to the headphone jack on a macbook pro.  How can I get this to work?

When you use an external device for input, GB often automatically selects that same device for output. It's an ease-of-use feature for most external devices. If your device doesn't give you the option to output to speakers/headphones, you don't want GB to do that.
Within GB, go to GB>Preferences, Select the Audio/Midi tab. In the Drop-down under output, choose "Built-in Output" and connect your external speakers/headphones to the Mac's headphone port (Alternately, you could use system preferences to direct your Mac's audio-output to your speakers and select "System Setting" in GB Prefs. The Mac's own speakers aren't going to be nearly as much fun as running it to your big speakers/headphones).
Hope that makes sense...

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