I guess just getting rid of the F75 is one way to go and I understand how confusing the F75 can be. When I got my first Ltd I was having some of the same problems that have been talked about above. I sent Dave J a PM and ask what I could do and he suggested I run one tone or 1F for a while. I wish I would have keep his reply just for times like this. But I did run one tone and it helped. But after a while I went back to 3 tones and kind of understand now that the machine is trying to tell me by way of tones what all it is seeing in the ground.
Now I am pretty much a coin hunter so I am listening for a little bit of high tone. So lets say I take a swing and get some low, medium, and some high tone. Well that gives me is a clue that the machine may have got a glimpse of a coin. So I repeat several swings to see if I can clean it up a little bit. Now I start watching the meter and if I can get a high tone I watch for good coin number and a few bars on the confidence meter. So if you can get a hint from all three you can be pretty sure you got a coin hiding down there.
So if you are trying to run 2, 3, or 4 tones keep in mind that the machine is trying to break up all the targets it sees in the ground into one response, which makes for some pretty bad music.
Now for me I kind of think of each mode of operation a different way to hunt, not a better way.
I don't hunt in all modes so I am not going to try and explain what all could be used for.
DE mode, all know that the processor is very fast in this mode and the swing speed will mess with the depth. So for high speed hunting I this is the way to go, med sweep speed will get you down at least 3 or 4 inches ball park, a little faster sweep speed should get down a couple more inches.
BP mode, sweep speed doesn't do much for you here except in the trash you need to go slow. For me you will get really good depth and can kind of move at your own pace. I run this mode a lot.
JE mode, I don't run this mode a lot but I have played with it just to see what it does on some small gold target. One thing I noticed is that you can detect smaller items at higher disc settings than other modes.
CL mode, the word here is slow and real deep. I haven't used it that much but I keep it in the back of my mind.
Just some of what I have found out about the different modes, just test them and see what they will do and then think of some way you can make it work for you. Keep in mind that you may have features on the F75Ltd that you will never need or use.
I am not trying to come across as a expert, but I have using the 75 for 3 plus year and I am pretty comfortable with the machine.
Ron in WV