LED Question
You can (if you want) buy a potentiometer at any eletrical parts store. This is what your dimmer switch is. You can get various ratings; even some that, when turned all the way up, will not burn your LED's--all without adding additional resistors to the LEDs themselves because the potentiometer is, in essence, a variable resistor. This is what your "dimmer" and "volume" buttons are: potentiometers. All you would do is connect one leg of the potentiometer to a constant 12V, and the other(s) to the LED.
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Unclejunebug
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