VOICE    Eric and Gayle provide voice-overs and promos for radio and television commercials, narrations for corporate and medical videos and documentaries, and live or taped announcements.    As trained stage actors, both Gayle and Eric do both spokesman and "real person" reads, and select characters and accents. Both excel at improvisation and interplay and are available separately or together. ON-CAMERA    Eric and Gayle appear on-camera in television programs and industrial and training videos and CD-ROMs, mostly, though not exclusively, in the New York Metro area. Relaxed, real performances, with humor when appropriate, are their specialty. Both are virtually one-take readers, which saves time and money.    They also appear live at conventions and meetings as hosts and presenters, separately or together.