It's all about the Software

Hello! the first audio is with SDR# , 2 meter band, ham qso, NMF 12 khz...the second is with SDR console without noise reduction, NFM 12 knz...device RTL SDR v3, gain set to 38 for both, same time, same antenna, same PC...where am I going wrong?

...nothing?...What noise reduction setting do you use for example in the 2 meter amateur radio band?

Perhaps not related to your problem - I notice your gain may be set just a wee huge tad higher than would make sense. That poor thing may be overloaded. I usually run mine at 18 which is about where the signal and noise both start going up when I increase the gain. Pushing it up beyond that buys nothing much except reduced spread between minimum detectable signal and overload.

{o.o}