Here's what I need:
My tascam 4-track has RCA outputs.
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The cable I have for this has 1/4 inch jacks at the end.

The inputs for the 4-track are designed for 1/4 inch inputs (guitar, mic)

What I really need is two things.
One is a way to run the output from the computer as an input into the 4-track.
Another is to run the output of the 4-track as an input into the computer.
What sort of set-up would I need for this. Is there a one-unit adapter designed for input and outputs that are 1/4, or would I just need to by new cables or adapters?