I have a pair of Panasonic RT-HP 161 headphones. They're plugged in the rear panel audio out jack on the desktop running Slackware64-14.2. The headphones produce stereo sound from web-hosted applications: e.g., YouTube and news site videos. But, using either the zoom-linux desktop application or a zoom test meeting on the web browser there's no audio output. pavucontrol shows the speakers as line out, but the headphone as unplugged. Advice needed. Rich