How do I connect my components using a 5 switch switch box?

I can try to help, but please provide more detail on ALL equipment being used.

5 in, 1 out. The single OUTPUT goes to the input on the Cary. Take your pick which one. The inputs (5 in and ONE out) plug what ever you want into it. As far as 3 tape units, that is a question of what you want to do.

To playback or record on a single unit, hook it into the tape loop and the other two INTO TWO of the inputs on the 5 way inputs.

You can play back with any but only record and monitor (adj. tone) with the one in the loop.. You don't have to use the loop out, that is option, but for monitoring and when you flip the switch (Tape Loop) you need the full loop of cables. The cables need to be routed back to the INPUT of the loop, to play back through your monitors (speakers) Switch flipped of course..

You won't loose a darn thing or hear any difference. Use short quality cables. Most RtR and Cassettes are single ended in and out.. Most not all..

I'm 66 passed my exit physical, hearing was just fine.. Way above average for my age.. BUT I still live with ear plugs in my ears through most of my waking hours.. Just a habit from being a HD mechanic for 45+ years. I have an abnormality in my ears, it left me in hoodies and muffs for years as a kid..

My Mid 40s I removed the inserts out of my ears. Real pain and some  ear infections plague users.. I had to be VERY clean in a VERY dirty environment..

My listening sessions sound wonderful at low volume because of the old practice..

If your hearing is GREAT, the only difference you will hear, is from one unit to the next.. VOLUME DOWN.. Always, then switch..

Enjoy ALL the senior moments.. And drink plenty of water.. :-) Does wonders for the ol memory..

Regards

This will be great to degrade your sound.Good luck though!!