Abstract: An in-plane position sensor detects positions along two directions or X-Y directions to produce a pair of position signals concurrently. The pair of position signals controls control parameters which influence upon a variety of effecters and addition processor which are implemented in a digital arithmetic unit (DSP).

Abstract: An electric instrument amplifier emulates an audio characteristics of a traditional vacuum-tube type amplifier. The electric instrument amplifier is formed in a single housing for amplifying an audio signal from an electric instrument. The electric instrument amplifier includes an A/D (analog-to-digital) converter for converting a first analog signal from the electric instrument to a digital signal, a digital signal processing circuit for processing the digital signal to add an intended effect to the digital signal, a D/A (digital-to-analog) converter for converting the digital signal processed by the digital signal processing circuit to a second analog signal, a tube amplifier having at least one vacuum-tube for amplifying the second analog signal, and a virtual power circuit formed with semiconductor devices for amplifying or attenuating an audio signal produced by the tube amplifier.

Abstract: An in-plane position sensor detects positions along two directions or X-Y directions to produce a pair of position signals concurrently. The pair of position signals controls control parameters which influence upon a variety of effecters and addition processor which are implemented in a digital arithmetic unit (DSP).