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For detailed information on the cards, refer to the NetLinx CardFrame, Control Cards, and NetModules Instruction Manual found on-line at NXC-VOL4 Volume Control Card The NXC-VOL4 Volume Control Card provides four discrete volume control channels with LED feedback. The volume control channels can be programmed for mono or stereo operation, and balanced or unbalanced audio connections. It supports programmable audio levels, audio mute, variable ramp speeds and preset levels. Use the on-board jumpe