Well, I was finally able to get that foo_output_asio.dll file in the right directory but now when I start Foobar I get the following message:
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Failed to load DLL: foo_output_asio.dll
Reason: Wrong version number; this component appears to have been built with outdated version of foobar2000 SDK and needs to be recompiled with newer version in order to load; please contact author of this component to obtain an updated version of this component.
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This Asio is a pain in the b...! haha
I'll try to post questions in the asio4all forum. There should be some experts there!