The ML flutey tones and lack of target overload modulation took some getting used to from me at first, coming from a Deus (talk about squawking, lol). But now that I have a few hundred swing hours it, I pretty much have no doubt when the Equinox smacks a coin (high conductor or nickel) and it pings like striking a golf ball with the sweet spot of a golf club. I like 50-tone, personally, which is less customizable then 5 tones (but I pretty much left the tone customizations alone even in 5 tones). Whether in 5-tones or 50-tones, I pretty much know it when I get a solid hit on a high conductive keeper with a rich, sweet tone. I personally have a hard time going back to my F75 now, it sounds like a toy piano vs. a baby grand in terms of getting useful, nuanced tone information before I dig a target, but I don't think I got as proficient on the F75 (especially in 2F) as I did on the Deus and as I am now on the Equinox, to be fair. I even now prefer the confident Equinox ping tone vs. my Deus which I have racked up the most swing hours on of all my detectors.
Sounds like you prefer multi tones (i.e., 2 or 5 tones) over 50-tones. The multitone customizations available on the Equinox are the best I have seen of any detector as you can customize the tone break, tone pitch, and individual volume of each tone bin independently. I think if you experimented with the custom tone settings, you could make it emulate, to a certain degree, the 2-tone setting of the F75. But you cannot get that varable pitch 2F for the non-ferrous target information that the F75 gives you which is a sort of hybrid tone/pitch setting which is unique to the F75, T2 and their other First Texas cousins. Gold mode on the Equinox does sort of have that VCO pitch like audio but it is quirkier and different than pitch mode on the Deus or 2F on the F75, so it is something I am still acquiring a taste for but does appear to have some value when hunting for targets in mineralizedasoil and/or iron infested sites. Still learning how to make best use of gold mode for certain specialized detecting situations, besides gold prospecting which is not something I have tried.
As far as Equinox multi tone customizations go check out these threads if you haven't already done so
http://www.treasurenet.com/forums/equinox/589932-my-expanded-case-3-tones.html
http://www.treasurenet.com/forums/equinox/591033-adjusting-zones-tones-my-3-tone-setting.html
HTH