Help for wireing metra line output converter to control bass with knob

[Jake02]

I have a 2005 Chevy Silverado, after market head unit, alpine amp, kicker comp r sub, everything is wired up, just tired of the hard bass on some songs so I’m adding the knob. Bought a metra LOC How do i do that as far as tapping in and all that?
Thanks!

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[1aespinoza 10+ year member]

How do i do that

I think this is a better option:

I use one like it for my old school amps. Easy hook-up and reliable.