Roland VT-12 Vocal Trainer, Black (VT12BK) Visually check your pitch in half-step increments with the illuminated pitch meter Detects two singers simultaneously for two-part harmony training in equal temperament and just intonation Onboard audio exercises with guide vocals and backing tracks. The pitch meter displays your pitch against the internal guide vocal for comparison. Fifty Lessons classical voice exercises with piano accompaniment and melody guide tracks; the VT-12 displays the pitch of the guide melody and your pitch simultaneously Review function for instant playback to hear your performance