Hi there.
I got Audacity 3.0.2 running on my Windows 10 Pro (64 bit) (Version 21H1) and when I select the USB input from my ionaudio Tape2PC and click on record, I get the following error message:
Error opening recording device.
Error code: -9999 Unanticipated host error.
Can anybody help in troubleshooting this and eventually solve it?
Thanks,
F.
OK, this could be a number of things.
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Do you have Windows permission to use your microphone? Turn on app permissions for your microphone in Windows 10
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Try Transport > Rescan audio devices
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Try switching between MME and WASAPI.
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Try rebooting
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For other suggestions, type “9999” into the search bar in the upper right-hand corner of this page.
Thanks man!
The above was it! For some reason, Windows was permitted using the mic, but the desktop apps weren’t anymore 
F.