After latest updates, cant make engine to backfire, no matter what i do. Tryed all kinds of lean-rich mixtures, low-high compresion, sizes from 1 to 8 liters.
Backfire? What do you mean by this?
Do you mean the pops and crackles that occur when you let off the throttle from higher RPM with a richer fuel mixture? If so, you seem to be right… I cannot get that to happen again.
They seem to have been lost somewhere along the way of reworking the sounds 
good find, they need to be added back in.