i'm pretty new to this, and i've got a question. i've got the codes in i want and all, but i keep seeing stuff like TX, RX, M, BM, RM, and i have no idea what these mean. and on the tones, i keep seeing stuff like PL and DPL. i have no idea what these are, and what they mean. is there an area on the main site that lists these? any and all help would be appreciated.