[digitalradio] What mode?

[n6tgk]

I'm new to a lot of the newer digital modes out there.  I just
recently installed DigTRX and WinDRM.  I've been listening to 14.236
USB and I keep hearing some buzzes that I thought were DRM but
apparently aren't.  I also don't get anything on DigTRX.  What mode
could this be?