That would be me. The dryer is a 1970 model and that unique panel was only produced for one year. These were very good dryers. I have the gas version of the dryer and love it!
did you post pics of your set(I'd be interested in seeing them, if they're here in the aw.org area).
I like the panel - reminds of my shortwave listening days in the early 60's.
Soft Heat for Kenmore dryers from 1986 onward is simply shifting whatever you have the heat selected for to low heat the last few minutes of the drying cycle., I.E. high to low or medium to low. No gradual tapering off like the true original Soft Heat.