TE121 - How to show active TX and RX gain setting's?

I’ve been battling some minor echo issues on my PRI. So I’ve been tweaking my txgain= setting in the zapata.conf.

My question is how can you tell what the current active gain settings are? Being a rookie I thought “dahdi show channel x”, but no gain settings. The reason I ask is that I’m not convinced Asterisk is changing the gain.

Thanks guys!