Just run the outs from the tape deck (L&R) into the analogue ins (the two 1/4" jacks marked In) on the 0404. Don't know what the jack setup on your deck is, you might need an adapter. Let us know if you can't figure it. The default setting on the Card's mixer will capture them, as long as the card is selcted as the input to your recording software. Come back if you need any more help.