Sequential Circuits Poly Sequencer For Sale. Designed to be used with the Prophet-5. We have not attempted to hook it up for a P5 to test it as our P5s are in storage at the moment. When powered up and not connected to a p5, the record button flashes. We don't have a tape to test it with. These ancient tape drives usually don't work at this point. We are selling it as a collectors item but can try to test its functionality (other than the tape drive) if you're a serious buyer and it's important to you. In exceptional physical condition.