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LME49720 LME49600 amp gain and servo gain adjustment? LME49600 Demo Board

Other Parts Discussed in Thread: LME49600, LME49720, LME49721, LME49726, TINA-TI

I am using the circuit of the LME49600 in AN-1768.  I would like to set the AV=20 for the lme49720.  My guess is that I increase R3 to 20k.  What do I do with resistor R5 in the servo loop?  Should this be left at 1k or do i increase it to 20k?  Does R5 affect the AC (audio) gain at all?  Any equiations for the AV gain or insights on servo design with varying gain settings would be helpful.

Thanks