audio processing unit 218 is bidirectionally coupled to the audio streaming interface 220 moreover the audio streaming interface 220 is bidirectionally coupled to the controller 224 the controller 224 is itself bidirectionally coupled to the flash memory 222 the programmable human interface 228 the programmable control 230 the usb engine 226 and the eeprom interface 234 the usb engine 226 has a first output coupled to the programmable human interface 228 a second output coupled to the programmable control 230 and is also bidirectionally coupled to the usb transceiver 232 the eeprom interface 234 is bidirectionally coupled to the eeprom 236 the usb transceiver 232 is bidirectionally coupled to the usb output connector 238 in operation audio electrical analog electrical signals originating from playing a guitar or other stringed instrument are generated from piezo pickups and or magnetic pickups the audio analog electrical signals are amplified by the magnetic gain amplifier 202 and the piezo gain amplifier 206 the amplified analog signals are converted into digital signals by the first and the second analog to digital converters 214 216 the digital signals are received and processed by the audio processing unit 218 in conjunction with the audio streaming interface 220 the digital signal processing system 200 is configured to process sampling rates such as but not limited to at least 48 khz for 16 bit digital information and.