Dear Maintainer,
First, appologies if this is the wrong package to report this to.
I have a Tascam Portacapture X8 which is able to work as an audio interface. In theory, the built-in microphones should pass to the operating system while the device itself should be able to monitor system audio. The latter, system aduio, works fine; however, I cannot get the microphones to pass back to Debian.
I was able to test this device on OSX; microphone input worked as expected.
I have included the verbose output from lsusb for the device at the end of the standard "System Information" section.