G'day Dave,
umm, mate, probably the main reason anyone would want to use ASIO is to minimise/eliminate latency. As you aren't using an external MIDI device for either input or output then ASIO is probably unnecessary.

That said, if you read the PDF I linked you to further up then you'll note that I was having quite some difficulty with latency and inconsistent tempo problems in my vista test bed HP notebook. ASIO solved that for me.

If you aren't having latency type issues then just run MME. It'll be fine.

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