How do I use my spliced tape?

Hint 1 of 7:

You know that Thomas has a walky-talky.  Where did you see the other one?

Hint 2 of 7:

Return to Klingmann's office.

Hint 3 of 7:

You're in luck.  There's nobody in there.

Hint 4 of 7:

Use your spliced tape on the walky-talky sitting on Klingmann's desk and
Gabriel will do the rest.

Hint 5 of 7:

Don't leave yet.