How do I open the middle door of the face

Hint 1 of 8:

When you opened one of the other 2 doors, did you hear a noise?

Hint 2 of 8:

That noise opened the doors.

Hint 3 of 8:

If only you could duplicate that noise, you could get in.

Hint 4 of 8:

Try using the DAT and the boom box from inside the shuttle bug.

Hint 5 of 8:

Of course, you can't record.  Maybe there's something wrong with the tape.

Hint 6 of 8:

Remember write protect tabs?

Hint 7 of 8:

You need to put the vinal tape on the DAT.