Hey man, I just had similar issues even though I enabled the computer sounds to blare out, but Premiere still didn't flinch. Have you tried setting the Audio Hardware in Premiere to MME (Microsoft Sound Mapper). It worked for me, since I was connected to a PC at Work that was set to ASIO settings (there is a Lexicon sound hardware inside the workbench), and when I tried playing back, there was no sound. When I set it to MME,it worked, so maybe this will help.
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