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A keepalive (KA) is a message sent by one device to another to check that the link between the two is operating, or to prevent the link from being broken.

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Crossfeed is the process of blending the left and right channels of a stereo audio recording. It is generally used to reduce the extreme channel separation often featured in early stereo recordings (e.g., where instruments are panned entirely on one side or the other), or to make audio played through headphones sound more natural, as when listening to a pair of external speakers.

The current Portage Tree is over several hundred megabytes in size, so syncing, especially with a low-speed internet connection, takes forever.