LTR system - does the 898T require the frequencies be set EXACTLY like 1,3,7,20 etc. like the 2055 or can you just put them all in a row , like if you had say 4 channels , can you put them 1,2,3,4 or do you have to go 1, then skip to 3, then skip to 7 , then to 20 ?? Thanks in advance !!