problem with track automation...

i’ve got the following problem and i haven’t found anything about in the forum yet:
i use the track automation to fade in one instrument. but while playing this (also after hd-rendering) there is an horrible noise (pop or crackle) at the ticks where the note is set. i think it isn’t the sample (i’ve checked it of course…), but how to solve this problem??
any suggestions?
thx a lot

can you send me a small example song ?

.rns file or as wav/mp3?

( stupid question? hmm, i think you mean .rns … )