nope, OpenSuse Tumbleweed doesn't install any of the pulse audio cruft. pure alsa. although it may be easier to use the pulseaudio gui's to configure which device is doing what.I see you mentioned alsa, so I assume you're running some version of Linux. I've gotten a bit lost with the march of progress in linux sound systems over the years, but my recent installations seem to be running pulseaudio by default. Any chance you're running pulse? It seems to like to clone interfaces on the fly when a new program is started, so identifying the sound device can be tricky. The best trick I've found so far is to launch pavucontrol. When you launch tg, you should see a new recording device created. If everything is set up right with the audio levels, you should be able to see the ticks as bounces in the volume bar on that device.
oh yes. although w/ a clip-on mic the positions are a bit limited, i've tried both the case back and front and 360* around. sometimes i can get TG on linux to start picking up a signal. not as much success w/ TG on Windows. no clue why.Also, sometimes the mic positioning can be a bit ticky. Try moving it around the watch. I think some people have even reported success with the mic right on the crown.
haven't had much time to continue to play w/ this. i was able to regulate the NH35 using the integrated mic from an average of -14.8s/d to +2.2s/d. this movement is VERY position sensitive, so i chose to aim for -2s/d in the 6up and 3up and let the dial up +13s/d help overnight to keep a good "worn" average.