Keyed

from WordNet (r) 3.0 (2006)

keyed
    adj 1: fitted with or secured by a key; "a keyed instrument";
           "the locks have not yet been keyed" [ant: {keyless}]
    2: set to a key or tone

from The Collaborative International Dictionary of English v.0.48

Keyed \Keyed\ (k[=e]d), a.
   Furnished with keys; as, a keyed instrument; also, set to a
   key, as a tune.
   [1913 Webster]

   {Keyed bugle}. See {Kent bugle}.
      [1913 Webster]