
via this auction
"For sale is a vintage Sennheiser VSM201 vocoder. VSM201's are very rare and perhaps the most incredible and versatile of all analog vocoders. These originally cost $20,000 and very few were made. I have heard only 5 are still in operational condition in the states. This one was fully serviced this past year and is fully functional. It is in great shape for such an old instrument, and even includes the original box! It sounds absolutely amazing. In addition, this vocoder has an incredible history. It was owned by Herbie Hancock! A certificate verifying this will be included in the auction. See pictures below for more details. Here is a short sound demo. This demo only scratches the surface of its features, demonstrating its most basic abilities."
