A keyboard provides an analog sound signal for a sound producing device. The keyboard includes an interface circuit that couples the keyboard to a digital sound source through a universal serial bus (USB) cable. The keyboard further includes an audio rendering circuit that receives digital sound samples from the interface circuit and converts the digital sound samples to an analog sound signal and a connector coupled to the audio rendering circuit that is configured to couple the analog sound signal to a sound producing device.

 
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> Multiple-paramenter instrument keyboard combining key-surface touch and key-displacement sensor arrays

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