via this auction
AWESOME SOUND
We started with a PIC microcontroller and 8-bit DAC to create a dual-pitch oscillator with modulation by waveform, amplitude envelope, detuning, and glissando. Then we added a gritty analog low-pass filter, integrated step sequencer, and simple, intuitive controls. Your initial experimentation will quickly reveal an astonishing range of output: from sweet and sublime to raw, thrashing, and retro sounds.
HACKABLE DESIGN
The NTH is designed for easy modification:
We’ve included an ICSP port for connection to the NTH’s PIC16F microcontroller. Use a low-cost USB programmer to modify, upgrade, or completely rewrite the firmware on your NTH.