Anybody know what is possible from within soundai.cfg

Many soundai.cfg files (including the ones for the deafult FSX aircraft) have start and shutdown sounds, flap sounds and touchdown sounds within them.I am pretty certain having fiddled around witt the .cfg files a little that the start-up and shut-down sounds cannot be played from commands in the .CFG (Alan Constable has an add-on which does this through a .fx file).Does anyone know whether the touchdown effects and flap sound can be played from within the soundai.cfg file if you put the relevant entry in, or whether these could only be done from a .fx file or a gauge.Has anybody had any joy in getting the stock FSX rainsplash effects from wheels and engines working on AI aircraft?