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LOGITECH HARMONY 650 USER MANUAL
No picture? No sound? No problem!
Adding a passthrough device to an Activity
A passthrough device is a device that you add to your system that a signal passes
through unaltered.
For example, if you use your DVD recorder (or VCR) to record shows from your cable or
satellite receiver, you may need to add your DVD recorder as a passthrough device to
the Watch TV Activity.
In these examples, the DVD recorder and the A/V switch are used as passthrough
devices.