How can I get my music off of some old dat tapes and 4 track tapes without buying the machines

How can I get my music off of some old dat tapes and tascam 4 track mixes without getting the machines I just to get them on a cd I have a multitrack digital recorder cd burner I didn’t really want to buy old equipment but I think I have to I can play my mixed tapes out of a cassette player into the mixer then into the recorder but the unmixed and dat would be to slow without a dat machine or 4 track I’m stuck it would seem if anyone knows a way please let me know