Can't access F4: Capture menue in Alsamixer

Hello,
I’ve a Raspberry 4 with a 2mic Respeaker Hat. In general it works but i can’t controll the mic sensitivity. When I choose F4: Capture in the seed-2mic-voicecard, alsamixer ends immediately and I’m back on the command prompt. OS is Debian 11 bullseye! Since the mic doesn’t catch everything necessary I appreciate any help to change the settings. Thanks in advance…