Hi Hari,
0. We are using LM4673 class-D amplifier.
1. We have observed through i2cdump by reading Register-79 MONO_LOP/M Output Level Control Register. I am attaching i2cdump for your reference while aplay. (Please visit the site to view this file)
2. Attached is the alsamixer's dump while aplay. (Please visit the site to view this file)
3. Yes
4. Yes we have checked but we observed no signals.
Thanks and Regards,
Shabbir Limdiwala