Keyed
Part of speech: verb
Definition: To fit (a lock) with a key.
Tuned
Part of speech: adjective
Definition: Adjusted in pitch or resonance.
Part of speech: verb
Definition: To adjust (a musical instrument) so that it produces the correct pitches.
Example sentence: 'Lost' did alright, you know. Not that I didn't get into it - I just never watched enough of them; but the uphill battle is that you've got to stay tuned.