Well,this could be a number of things ....First as was pointed out try the ""fresh batteries '' it almost sounds as if you're describing the ''low battery singnial'' and that would make it very noisy the tones wouldnt vary at this point though you would be overloaded with a constant"" buzzing bloop"" that wont go away,,,As also was pointed out be sure its not in the all metal mode, many of us have had it ''accidentendly clicked'' there and scratched our heads for a sec.....all that aside ,now you got fresh batteries you're in the disc mode with the switch toggled to band 2,and the sensitivity clicked to auto mode (all the way left until it clicks).....now is you back yard near any power lines or right in town or something that may have major electrical interference??? if so go some where away from the house a bit .....to calibrate the meter toss a us dime on the ground away from any other conductive source,now to see if you are running what I consider ""smooth'' you can click the audio to fixed for a minutie and calibrate the meter ,turn the machine on and rachet the volume to max,set the threshhold to the point where it's a consistant ""Humm"" not a loud crackly humm or a weak broken up humm a nice crisp "HUMM"" ......now its on and sounding smooth with the humm being a consistant and constant humm,pass the coil over the dime untill you hear the threshold disapear and its replaced with a nice solid tone at this point glance at the meter whlie keeping the coil over the dime and the tone constant ,turn the meter knob untill it reads 550 and just sits there ,it will flicker around a bit but should lock up at 550,after this is done pass the coil away from the dime slowly untill the threshold returns to the constant humm, now go slowly back toward the dime,repeat this over and over untill you see the point when the threshold disapers and the coin signal comes in ,,,,,you will have to work with the machine for a while to really understand it ....Many new Sovereign owners have gotten frustrated or felt the machine didnt work properly and eventually either gave up or moved on to something else....those that stuck with it and learned the sounds have been well rewarded for there paitence .....you need to work Slow and slower with the sovereign,and this drives some crazy....But i belive if you take the time you will see its not really broken its just tough to figure out.....to be honest I thought the friggin thing sounded like damn R2-D2 from star wars or something .....but it started to come together after some time and use ....the meter can be tricky as well and many people say it doesnt work right ....my suspicion is you may need to calibrate it ....although I dont think or recall the meter ever reaching 900 but anything is possible ............I hope it doesnt turn out you got a bunk unit,but sometimes that happens also,was it a brand new unit from a dealer??? if it was a used one it may pay to have it checked out by a pro .........any way hope you get it together and start making some solid finds ...........I can attest to the frustration I was in the same boat a while back ...I kept comin back here over and over with questions and problems and all the normal stuff..........I feel confident you will suceed just stick with it my friend and keep comin and let us know how you do ...........................