Hey
Well, the unmuting and muting is handled scene by scene by the mixing desk/computer, but the operator will be watching the stage very closely and if a character is singing to another character (who is not singing but is in the scene), then either itll be pre-programmed that the non singing character's mic is muted, or the operator will bring the fader right down until the non singing character is due to sing again.
When two characters are singing right in the face of each other at the same time, then the operator's task becomes incrediby difficult, but ultimately, the physics of sound dictate that there will be bleed into the other character's mic, because the mics used in theatre are omnidirectional (and therefore pick-up sound from every direction).
However, in some shows, the above problem is abbated with a complicated, but simple method of sound re-enforcement. The radio mics (and some of the orchestra) are split into different systems (A&B), so in a duet say, one characters mic will be in the A system, and one will be in the B system. This doesnt really stop the sound bleeding, but it does help abbate the phase coupling that happens when two mics and two singers are in very close proximity. This technique generally makes the sound clearer and less muddy in duet sequences.
Notable examples of shows that use A/B systems are 'The Producers', 'The Phantom of the Opera' and 'Brundibar'.
This particular problem is helped in shows where actors wear mics that are very close to their mouths (sonically better, but visually intrusive), because the mics become more directional, and therefore there is less bleed into other mics onstage. The most commonly used headband, or boom mics, are the DPA 4066 and 4065, and the countryman E6 & ISomax HS. Sennheiser MKE-2's are also often used in an adaptor that makes them into boom mics.
Updated On: 6/11/06 at 02:13 PM