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$ alsamixer
The Windows interface for the Creative Labs version of surround sound (CMSS 3D) provides a single slider for front-to-back balance. Linux exposes two 3D sliders: "Center" and "Depth." One can make coarse adjustments to the alsamixer level controls by pressing the up|down arrow keys, or with the mouse wheel.
Does anybody know how to make fine adjustments in alsamixer?