I dont have the tone mod on my Pro, started several times to order one but didnt. That tone of the Pro has a language of its on, unless its a real deepie amongst some trash/iron. While I am not a relic hunter per se, I do find interesting things as most of the places I hunt are old home/farm sites. The round concentric coils definetly help with those bottle caps though I do get fooled at times by the aluminum ones.
The Pro, in the GEB Disc mode requires a bit faster sweep to get deeper plus in this mode, it is a slower responder to targets which makes it difficult in very trashy spots. BUT, in the GEB SAT mode ( which is all metal mode,however it does require coil movement unlike a true no motion all metal mode) and with the small 5.3 coil, you can work a pretty nasty spot because you can slow your sweep speed down being able to work targets close together. I bet with that tone mod you have that would be an enhancement worth having. I work in both modes but primarily use the GEB SAT in my sites with a lot of iron. Ive used it so much, I can tell when its a coin or token a lot of times; just has that smooth round sound. But I also have to tell you, Ive done pretty well with the 9.5 concentric in trash as long as I stay in the GEB SAT mode. Ive used the TR mode at times, in these iron sites, just experimenting and have found targets, however I dont believe it gets as deep. Dont be afraid to crank the sensitivity up especially on a deeper iffy, itll surprise you. Funny, I have a M6 also and would think with its fast response time and being able to sweep slowly I would use it more in these places. And I have used it but the XL Pro just seems to excel for me for some reason, I guess its just what you have confidence using.
Well, Im no way an expert difinetly not technical,lol. I hope you like your Pro, it will serve you well in what area of use you intend it for.
Please , once you become acquainted and confident with it, let us know how the tones work out for you.
HH,
John