I come from Bleep Labs.
Buñuel is a little difficult to “play”, lacking traditional controls. He has a volume control on the side, a pitch switch that lets you select between two pitch ranges, a LFO switch that lets you turn on or off a low frequency oscillator, and a LFO speed knob on front. The main control is his “nose”, a light-sensitive photovoltaic cell that affects pitch, and to some extent, volume. He has a flashing LED on the end of this antenna to provide some input to his nose. The flashing of the LED is affected by the LFO speed.
Despite the limited controls, it produces a surprisingly wide range of sounds, some of them quite glorious.