Hi,the reason that I will stay with beta 13 for now is that I havent had any other problems with it(none that bother me anyways).Now that i'm aware of the DSP bug i'll be careful when making any further adjustments in that range.I dont know that much about the "Q" setting but I find it hard to believe that having the ctr. frequency at 50hz would be able to accurately affect a 30hz signal without causing everything in that range to change.