Yes , the DX-100 is a 4 Operator FM synthesizer . All synthesizers that are under the control of a micro processor use an operating system , sometimes they eventually have problems when they try to boot up . This is stored on a boot rom chip which is like a computers harddrive in a way . It tells the synthesizer what to do , where everything is , and how to operate them . It's been a long time since I had one of those , but I will try and find out what the procedure is .