I have used MMTTY within Writelog for years. Always used FSK from a com-port with a simple transistor switch. Used on old TS-930, TS-950 and IC-756PROII. Many contests, much DX. Never had a problem. I like using FSK because of filters available with all of these rigs. Also do not have to set an offset for the packet spots. Just my 2 cents. Jim / NU4Y