Unfortunately, some audio input doesn't seem to drive a large enough voltage difference between loud and quiet parts (i.e. some audio yields a range of only .7-.8V and therefore doesn't use the entire output display). Because the decibel difference between each output on the IC is fixed, I want to amplify the magnitude of the difference between the peak detector voltage and something like .6V.
I tried to do this by placing a diode after the peak detector and then amplifying the result relative to ground but this resulted in a high voltage (~4V) at the LM3916 input. I don't really understand why that happened and would be grateful to hear any ideas of how I can accomplish this improvement.