Richard Storer wrote:
My first issue is for some reason booting Linux with my device already attached to the USB port produces no audio output, however capture is functioning. I've tried mute, unmute via alsamixer but it seems like the amplifier circuit inside hasn't turned itself on properly. The cure for this (and 100% reproducible) would be to unplug / replug the USB cable or simply connect to USB after Linux has fully loaded.
Are there any mixer controls that have a different value in these situations? (See the output of "amixer scontents" for your device.)
While Line-In capture does function on this device the signal levels are extremely low. Unfortunately there is no Line-In mixer control for my device
What is the output of "amixer scontents" for your device?
Regards, Clemens