Stream directly from a USB sound card
- Plug your scanner's headphone jack into the mic jack on the USB sound card dongle
- Start alsamixer
pi@raspberrypi:~# alsamixer
- press F6, choose the "USB Headphone Set" entry
- press your tab key to select the "Capture" device volume control
- use your "up arrow" key to adjust the level to it's lowest level possible (6)
- press escape to exist alsamixer
- run the following command to save the volume settings
sudo alsactl store
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