Device for breath control of apparatus for sound or visual information

A device for producing signals for the operation of apparatus for producing sound or visual information in response to said signals, the device comprising:

• a mouth piece having a plurality of air pipes adapted for the selective passage of sucked and blown air from an operator, at least a portion of each air pipe comprising a light transmitting wall adapted to allow transmission of light through the pipe;
• light responsive means located on one side of the pipe adapted to receive light from the other side of the pipe through the light transmitting wall;
• light emitting means on a side of each pipe opposed from the light responsive means, the light emitting means being adapted to illuminate said transmitting wall;
• actuating means comprising a ball within each pipe movable under the action of air displacement within the pipe from a first position i which it blocks the transmission of light through the pipe into a second position in which it allows transmission of light through the light transmitting wall, the actuating means being biased, in use, into its first position wherein the ball is confined against movement other than between the first and second positions by partition through which air flows freely and located upstream and downstream off the ball in the pipe;
• and
• photosensitive signal generating means for each actuating means located in a path of transmitted light.