Hi Greg.  Right now I"m using the auto chuff.  Set up right, it is very realistic even at slow speeds.  I"m trying not to run it too much due to the counterweight  issue, but I'm sure I can fine tune it even more if I want to.  Do I dare say that it was PNP?   One other thought, price wise, its a lot less for one QSI board, than say a 383 and a P5.  Not quite as much flexibility but it works for me.

Al Wallace

At the risk of being simplistic  , I ordered and installed the QSI motor and sound board for the K.  Pulled out dummy plug, plugged in the QSI, and whadda ya know  , everything works like its supposed to.  DCC of course, I don't know about any other.  Just thought I would throw this in here. 

Al Wallace