Hello Ashok,
A thicker or deeper voice would be a BFO setting issue.? The best way to set the BFO is to tune to a static-only frequency and use an audio spectrum analyzer to center the noise plateau.? Ashher Farhan has a video on calibrating the V6:
You do not need to do all three steps, only the last step.? Unfortunately, the BFO Tuning aid no longer works.? There are free PC-based programs that can be used:
or
I use the Windows version in the second URL.
You want the plateau centered between 300 and 3000 Hz.
73
Evan
AC9TU