Hello Les, with the settings that come with the SatPC32 12.8b setup file you can switch on the 67.0 Hz and the 74.4 Hz sub tones of the IC-910H. While tracking SO-50 click the SatPC32 "T" control (in the uppler left part of the SatPC32 main window) to "T1". That will switch on the 67.0 tone. Click "T2", that will switch on the 74.4 Hz tone. Clicking to "T0" will switch off the tone. Important: I suppose you have the American version of the IC-910H. So, make sure that you have installed the English program version for AMERICAN users!. The European English program version doesn't set the tone frequencies of the American version of the IC-910H, because the tone frequency setting commands are different.
The program stores the sub tone frequencies in "SubTone.SQF" in the SatPC32 data folder. The file contains already the necessary settings for SO-50.
Thanks and 73,