Sorry, I write through Google translator. If there is no technical possibility to implement soil balance at the hardware level, then it is possible to make a pre-set for heavy soils that will work only in user mode, this is suitable for 340 and 440 and 540. I think that I do not need to change the main programs, they are good, not only one is enough for soil with high salinity. Maybe there is a minelab service where can I write this sentence?
It is also good to make this user mode single-frequency with a low frequency of 5khz and a high value of iron bias for accurate identification of iron. But all this is optional, although it would be nice. The main thing is to make the soil balance for heavy soil. A single-frequency mode could additionally be done in the relic program of 440-540 models, which is intended for depth.
Also, in the user program 440-540 models, and the program all metals on 340 models could be made polyphonic, it can also be trashhold but not completely, it will turn out a completely different program with other search capabilities that will significantly expand the detector's capabilities. In general, all this can be realized in the mode of one user program, but for 440-540 I would like to use the 5khz single-frequency mode in the relic program. I would like to convey all this to the minelab employees.