you really should just go direct to speakers from the guitarport.... adding the extra soundcard is probably adding the latency....
different OS, means different drivers... radically different since you went to 64bit....
so the situation is not surprising....
+1 to TheRealZap.
Connecting the outputs of the GuitarPort to your computer's sound card input will create latency. I agree with TheRealZap's suggestion to connect your speakers or headphones directly to the outputs of the GuitarPort.
There is a great optimization guide from Microsoft available at the link below:
I am having this exact same issue. On windows XP and Vista, I could run the guitarport to the line in on my motherboard with absolutely no latency and great sound. Now, in Windows 7 64 bit,I get a huge amount of latency using anything but the headphone jack on the guitarport, on the exact same machine. It looks like the drivers aren't really ready for prime time on windows 7. Let me know if you get it figured out, and I shall do the same.
Yes, I Have it too!! was perfectly fine, NO hardware changes at all!!, But Last week I dowloaded v3.72 and all of a sudden I noticed this delay from when I play to when I hear the sound.. I hope Thats what everyone is talking about!! I am running windows 7 x64 AMD 1055t 6 core cpu and 8gbs of ram.. never had a problem until now!!.
Anyone have any Ideas? I tried rolling back the drivers but was not able to do that.... tried to uninstall and re-install, no luck.... WTF????