Abstract: A sound mixing console operative for combining or processing sound signals of a plurality of input channels is described. The sound mixing console comprises a plurality of sound signal input channels, an input channel fader control system having a plurality of input channel faders which can be selectively coupled to respective ones of said plurality of sound signal input channels. A master section has a plurality of control group faders each for collective control of a different selected group of sound signal input channels. Means are provided for coupling the sound signal input channels of one of said selected groups to respective input channel faders thereby to permit individual adjustment of the sound signals of the input channels of said selected group.

Abstract: A sound mixing console operative for combining or processing sound signals of a plurality of input channels is described. The sound mixing console (1) comprises a plurality of sound signal input channels (2a, 2b, 2c . . . ), an input channel fader control system (10, 12) having a plurality of input channel faders (16) which can be selectively coupled to respective ones of said plurality of sound signal input channels (2a, 2b, 2c . . . ). A master section (14) has a plurality of control group faders (17) each for collective control of a different selected group of sound signal input channels. Means are provided for coupling the sound signal input channels (36) of one of said selected groups to respective input channel faders (16) thereby to permit individual adjustment of the sound signals of the input channels of said selected group.

Abstract: A synthetic guitar includes a body, a neck extending from the body, and at least one touch sensor at the neck for indicating finger position of a user. The body has a receptacle for removably securing a tablet computer to the body. The tablet computer has a touch screen for indicating finger position of the user. A processor of the tablet computer is programmed to receive input signals from the touch sensor and the touch screen and to produce an output signal based at least partially on the input signals. The software can enable the synthetic guitar to be used as a music synthesizer or to be used as a video game controller. The synthetic guitar can also include a retainer for removably securing a portable media player to be used as an additional video display while playing the guitar.

Abstract: A circuit for processing an audio signal includes an input stage to which the audio signal is applied and an output at which the processed audio signal is presented. The circuit comprises first and second input stages (11, 12) having nonlinear performance curves, the first stage receiving the audio signal at a specified phase, and the second stage receiving from an inverter (13) an inverse phase of the audio signal. A positive half wave of the input signal is processed nonlinearly and the negative half wave is processed linearly. A difference amplifier (14) receives the signals produced by the first and second input stages and generates an audio signal representing a difference between the signals present at its inputs.