3.2 4.2 am demodulation audio audio teensy 4.0 cable canbus vusb shottkey custom board d/a a/d ..clock reference digital noise faust gpio ground hardware dac midi2cv header files host host cable hub i2c ilovemesodamnmuch lcd mcu mackie midi microcontroller midi mididevicei midiport music optocoupler pc817 optoisolator pc817 pcb phoneme phonetic ports power propshield radio resolved rpm rs485 sd card sdr radio secure lockable sensing solved speech ssb teensy teensy 2.0 teensy 4 teensy 4.0 teensy4.1 teensy 4.1 teensy 4.1 poe teensy 4.1 usb fail timeout tts tube amps usb-host usb device usb hid usb host usbhost wire