Possible Clues:

• How an edge is spoken in play?
• Whispers 'When? About eleven?'
• Thoughts on the stage, in a manner of speaking
• The side inside as they're spoken
• Words spoken so that only certain people will hear
• Remarks other players ignore as the team comes in
• Whispered wisecracks
• Words spoken so that certain people won't hear
• Some monologues
• When fish appear, not everyone hears them