SURE AB32313 amplifier setting gains

I need to know how to change the gains for a SURE AB32313 two channel amplifier. The spec. notes a 29, 31, 32 db gain selection. There are no marked gain selection switches or jumpers on the board. I need to match the output of the ADAFRUIT sound file player (pre amp).
 
Depends on your speaker efficiency. Try the lowest setting on the amp first, and see where
your volume control knob ends up. If it is somewhere roughly centered, that is fine.

If it is turned up fairly high, then try a higher gain setting for the amp. But the range of gain
adjustment that is available is rather small, so it should not have a large effect on the results.
 
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The SURE AB 32313 amplifier does not have a gains setting pot, dip switches, jumpers, or any indication on the module board as to the setting of gains. The amplifier spec. indicates a 29, 31, 32 available gain range. What is the proceedure to select one of the gains.

Lee