Thanks to Owner-Manuals.com! This manual was exactly what I needed. As Amana was purchased by Maytag and later by Whirlpool, there was no way to receive it from their websites. I was lucky to find this resource.
Great to be able to set channels again, on an old but stoll fine working TV
Text excerpt from page 27 (click to view)
Setting the Correct Gain Structure
l. The gain structure is now correctly set�you�ve optimized the level of all signals coming into and out of the MIXPAD, and the end result will be minimum noise and distortion and maximum clean sound. You�ll now find that the majority of your mixes can be accomplished with most channel Level controls at or near their 2 o�clock �0� (unity gain) position and that the main Left/Right peak LEDs rarely if ever light (remember, if they do light, it means that something is distorting!). If you need to make adjustments to the overall level, alter the level control of your power amplifier.
If you encounter difficulty with any aspect of setting up or using your MIXPAD, you can call Samson Technical Support (1-800-372-6766) between 9 AM and 5 PM EST.