Check the listing for details. Auto-Step Synthesizer (Handmade, Rucci Electronics). Condition: New. Listed at 75.00 USD. This device is based on a stepped-tone generator but with a sweeping LFO giving it an almost automated looping effect, as well as a low-pass filter that allows you to sweep the high-end in or out.Along the bottom you have controls for LFO speed, frequency, and pulse length. At the top is the low-pass filter and volume. The case is extremely tough die-cast aluminum, painted glossy white.With a 1/4? output jack it is easy to connect to amps, effects or recording equipment. It is powered by an included 9volt battery or any 9volt center-negative DC adapter. There are also 1/8? sync out and sync/CV in jacks, this will allow it to communicate with any equipment that makes use of 5volt clock. This was designed and hand-built in Oakland, California.It is capable of many varied sounds and this description does not do it justice. Please watch the video demos...https://www.youtube.com/watch?v=setALsjdgqEHere is a video of the Auto-Step Synthesizer paired with a CV Sequencer...https://www.youtube.com/watch?v=56fBmc7NMQcHere is an example along side the Minimal Drone...https://www.youtube.com/watch?v=0sWcdXaWQBY