I changed out a blown-up Axxent for a 9.0 Axxess and kept the same phones (520.4300 except for a couple w/ display). Now I need more page port output. Another tech said that I could probably increase the output maybe with On-Line Monitor. I looked but did not see an obvious adjustment. The exsisting Wheelock amp already has the telephone input so high the speakers are humming. Thanks for the help.