The Collaborative International Dictionary of English v.0.48:

Tune \Tune\, v. t. [imp. & p. p. Tuned (t[=u]nd); p. pr. & vb.
   n. Tuning.]
   1. To put into a state adapted to produce the proper sounds;
      to harmonize, to cause to be in tune; to correct the tone
      of; as, to tune a piano or a violin. " Tune your harps."
      --Dryden.
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   2. To give tone to; to attune; to adapt in style of music; to
      make harmonious.
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            For now to sorrow must I tune my song. --Milton.
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   3. To sing with melody or harmony.
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            Fountains, and ye, that warble, as ye flow,
            Melodious murmurs, warbling tune his praise.
                                                  --Milton.
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   4. To put into a proper state or disposition. --Shak.
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Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "tuned":
   accordant, according, assonant, assonantal, attuned, blended,
   blending, chiming, concordant, consonant, harmonic, harmonious,
   harmonizing, homophonic, in accord, in chorus, in concert,
   in concord, in sync, in tune, in unison, melodic, monodic,
   monophonic, musical, songful, symphonious, synchronized,
   synchronous, tuneful, unisonant, unisonous