Originally Posted by ramblinche81
Go to amazon and look at piggyback RCA cables which allow two inputs to a single port.
Think of it like a reverse splitter.
That would require unplugging the TiVo from the wall socket when you want to run the Roku to keep the outputs of both from being fed in to the TV simultaneously.
This is really a job for a switch and not a Y cable.
Or an older AV receiver that does switching.
Check Craigslist for either, and if there's a local video game store that takes equipment trade-ins, see if they might have a switch as well.