I'm retired and getting back to designing and modifing loudspeaker systems I spent some time at DWD loudspeakers in the "70s. Then on to rock and roll systems. Opened a shop in Fresno called Clearwave Audio building surround sound speaker systems for the UA Cinemas. Had to close down because Peavey bought the rights and made me stop. (never do a handshake agreement with friends) Moving on, I finally became a logistics and designer of (Big!) tradeshows for Pelco (was Schneider Ele.) Now finally I have the time to give Loudspeakers another try. Way back in the early '80s I had a Apple IIe with PRODOS running SDS loudspeaker design software. I still have all the floppies and manuals! I still have my LinearX LMS and the dongle for LEAP along with a couple of old pentium processor PC. Maybe I'll get lucky and all will install smoothly (DOS 6.22).