NTH Music Synthesizer

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"The NTH is an open source music synthesizer featuring instant fun, awesome sound, and a hackable design. The NTH Music Synthesizer is the first product from NTHSynth. It is fun to use, sonically-rich, and hackable by design.
The NTH is designed so that a complete beginner can quickly craft incredibly varied timbres. For the synth veteran, the NTH offers relief from layered menus and obscured functions. The NTH puts a smile on the face of musicians and non-musicians, synth geeks and synth novices, children and adults alike.

It has a PIC microcontroller and 8-bit DAC to create a dual-pitch oscillator with modulation by waveform, amplitude envelope, detuning, and glissando, and 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.

NTH Music Synthesizer is hackable by desing, so you can make easy modifications. It have Audio Output, ICSP port for connection to the NTH’s PIC16F microcontroller, and MIDI features (In/Out). It works with a 9V battery."