CMU US KAL Diphone
This databases consists of a set of nonsense words containing all phone-phone transitions for US English. This database is free for any use (see licence for details). This database includes, waveforms, laryngograph (EGG) files, hand corrected labels, extracted pitchmarks, and various support files. It is released both as an example and in the hope you can make the festvox_kal voice sound better.