I have recently acquired 2 syncrowave 351 machines. Neither have the pulse and sequencer or soft start features. My question is can these features be added? I plan on removing my syncro 200 and selling it. I don't like the way it pounds on when I need a delicate start. I don't tig nothing other than aluminum and after a lesson learned that the 200 wasn't up to the task I bought these 351s. I can't swing a new 350 lx so did I make a mistake? Thanks a bunch