Track 1: Alto 1 Predominant - R Douglas Helvering

Track 2: Alto 1 muted - R. Douglas Helvering

Track 3: Alto 2 Predominant - R Douglas Helvering

Track 4: Alto 2 muted - R. Douglas Helvering

Track 5: Balanced Voices - R Douglas Helvering

Track 6: Bass 1 Predominant - R Douglas Helvering

Track 7: Bass 1 muted - R. Douglas Helvering

Track 8: Bass 2 Predominant - R Douglas Helvering

Track 9: Bass 2 muted - R. Douglas Helvering

Track 10: Soprano 1 Predominant - R Douglas Helvering

Track 11: Soprano 1 muted - R. Douglas Helvering

Track 12: Soprano 2 Predominant - R Douglas Helvering

Track 13: Soprano 2 muted - R. Douglas Helvering

Track 14: Tenor 1 Predominant - R Douglas Helvering

Track 15: Tenor 1 muted - R. Douglas Helvering

Track 16: Tenor 2 Predominant - R Douglas Helvering

Track 17: Tenor 2 muted - R. Douglas Helvering