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In XP, I could open the recording panel from the tray and "select" the wave-out. then, in all applications (like Winamp) I could tune to the linein and capture/use that data (e.g. using Winamp's Milkdrop to visualize the audio coming from a website or other application)

I have no idea how to do this in Win 7.

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JACK is system for handling real-time, low latency audio (and MIDI). It runs on GNU/Linux, Solaris, FreeBSD, OS X and Windows (and can be ported to other POSIX-conformant platforms). It can connect a number of different applications to an audio device, as well as allowing them to share audio between themselves. Its clients can run in their own processes (ie. as normal applications), or can they can run within the JACK server (ie. as a "plugin"). JACK also has support for distributing audio processing across a network, both fast & reliable LANs as well as slower, less reliable WANs.

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it sounded promising, but I couldn't get it working - they don't offer a ton of docs... – Tyson Oct 31 '10 at 8:47
I had similar problems with it, still waiting on answers. There's another called Virtual Audio cable too, but it was problematic as well. – NginUS Nov 13 '10 at 12:19
let me know if you get anything working! – Tyson Nov 20 '10 at 22:21

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