Might be the Rios in my area, but I cannot tell the difference between a jake gobble and a tom gobble... They all sound the same to me...
I have heard toms with a very tentative/half gobble, and I always assumed that this had to do with the state of nervousness or trepidation... I have heard jakes double-gobble with authority, and just knew I had a big ol' tom coming in, only to see a 1" beard...
I sure wish I could tell the difference between the toms and the jakes from the gobble, as it would certainly save me some time and energy...
What are the specific differences in the gobble you hear between a jake and a tom? Any links that compare the two?