When using a BH Tracker IV what is considered trash noise? Is it when you get both the high and low beep on the same target? I've noticed that pop tabs and other types of trash tend to sound like that while coins hit more pure. Will coins also hit both high and low on occasion? I run with my sensitivity on 3 or 4 o'clock and my disc at 10 or 11 o'clock. Been pretty much digging everything though unless it barely registers (I've found that this is normally nails).