Stryker SR-477HPC2 User Manual page 6

Echo Volume: Varies the volume or number of echo repetitions. To
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increase the echo volume, rotate the control clockwise.
Echo Delay: The Echo switch turn the echo on. A big advantage to
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this is you can turn it off and then back on with the switch without the
need to adjust your volume & delay potentiometer. To turn the echo
off simply move the switch to the middle position.
Channel Selector: This control is used to select the desired transmit
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and receive channel. Please note the "LED" switch must be in the
center position for this to function correctly.
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