Ya, sometimes when I search in sites where there are deep targets made of copper or silver, I would like to have both a low frequency and a high one in order not to miss small targets (especially low-conductivity metals) at the same time.
Sometimes I would like to test the old but very interesting Minelab E-Trac in such places (I am also interested in the VDI technology implemented there), it works on the principle the FBS. But its processor is outdated and weak, it is definitely difficult for it to process 24 frequencies at the same time, I think that compared to analog devices it will be very slow and ineffective on clogged sites.
Therefore, I am not ready to buy such an expensive device just for temporary curiosity.
But if an analog device with simultaneous processing of two frequencies was implemented, it would be great!

I use Deep Tech VISTA X
My dig channel [www.youtube.com]