The only way is to pick two that you want the TiVo to automatically switch between and get the second input modification done. The TiVo does not have the ability to know of three inputs as it can only handle the selection of up to two.
So therefore one will either have to miss out or get manually switched. My advice would be to drop the DVD player and attach this as a secondary input to your TV if the TV has two A/V inputs. If the TV has only one A/V input then put a switchbox in to select either watching the TiVo or the DVD player. Then let the TiVo have the inputs from the other two and automatically switch between them and control the channel changes on these two devices.
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