To correct this issue, click on SAM Broadcaster’s Desktop B.
In the Encoders section press the blue DSP button to use Select Audio DSP Pipeline as audio source.
If this action doesn’t correct the problem, click on File on the main SAM Broadcaster menu, select Config and go to the Audio mixer pipeline section. In the mixer group, click on AGC and choose the Soundcard AGC option. Make sure the Use Soundcard AGC option is not selected.