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Audio Layer selects which layer to get the audio from.
Channel selects Left or Right audio channel. Mix will use both.
Use Comp fps - when this box is checked one keyframes per frame will be generated.
Keyframes per Second - when the box above is not checked, this parameter sets how many keyframes per second should be generated.
Apply - when pressed, keyframes for the work area duration are generated for the active range(s).
Delete - when pressed, all keyframes in the work area duration are deleted for the active range(s).
Cancel can be used to cancel an Apply command. Delete commands cannot be cancelled (they are normally fast). All commands can be undone using Cmd-Z on Mac and Ctrl-Z on Windows.