thank's piston79 for answers, but can you use simple and deep explanation please,
unfortunately I can't understand all your dialects and your abbreviations,
(Peremena chastoti) = ???
I think adding some simplicity and deep explanation of abbreviations in posts make them more helpful !
All labels are on russian. "Peremena Chastoti" is "Change frequency", better find the post (it's from Hpasp), he explained perfectly and with better english than mine...