The one and only absolute BEST software "suite" to control the radio, allow logging AND play PSK31/63 is none other than the world famous Ham Radio Deluxe by Simon Brown www.ham-radio.ch
The IC706 family does not NEED a control program, once you set up the menu, I just leave it alone... but, HRD gives you the option to do anything you want from the computer than you can do from the front panel.
oh yea, the software is FREE!!
I have not done it yet, but I want to try to run PSK31 from any workstation on the network someday.