As far as sounds on my Tesoros only the biggest gold pieces, like large class rings, actually sound different than other targets, enough that I can tell, all other smaller pieces don't sound any different than any other good target nor does gold sound different on my Fishers either...no matter what size they are.
When it come to gold I go by target behavior and listen for the solid tones and look for solid stable numbers on my screen units.
For me gold seems to have always come in very solid on all my detectors vs most, (but not all), trash that seems to be a bit more jumpy.
This method became more successful for me only after learning my detectors as well as possible and studying trash behavior and gold very closely and how it behaves because over the years I went from digging a ton of trash to trying to dig as little as possible.
All of my gold has been shallow at about 5" or less also, deeper gold might well act differently.
I have dug about 3 dozen pieces of gold in 7 years mostly in extreme trashy parks, the bulk of them after changing to this high percentage type method of digging mostly just the more solid signals I come across.
I could miss some great treasure of all kinds doing it this way but my track record is shockingly and surprisingly good so I don't let the what if's bother me so much anymore.
I figure if I dug way more solid signals on any given hunt and avoid spending time on the jumpier ones I have a mathematically better shot at the good stuff and that math works for me, or has so far.
I exert way less energy and spend way less time wasred and still manage to find some great treasure this way.
There is a local park right near me that I have hit a hundreds of times, it is old and is infested with iron and trash and has been hit for decades so most consider it hunted out.
This is what I dug on one hunt where I actually did dig every signal that wasn't iron while learning to use my first DD coil a few years ago.
For some this is an insane type of site to hunt, but me, I am crazy and I love a good challenge.
In this same park I was hunting an area where there was a ton of trash, iron, can slaw and about a thousand tabs of all kinds.
At this time I was heavy into this high percentage method.
On this hunt I got signals on all kinds of things and in particular about 2 dozen or more beaver tail tabs and some larger sta-tabs which on my F70 all came in at about a 41...low to mid 40's anyway.
I dug a few more solid ones but avoided the rest because they all jumped a little too much from at least one way but also from more than one direction.
Then I came across a signal that was a super solid 41-42 that never changed on any pass from several directions...that one I had to dig.
It turned out to be this 8.8 gram 14k huge religious medal that I believe was standing up vertical at 4" deep.
It was so big and blingy my wife didn't want it...a very rare thing in my world.
It was a good choice to decide to dig this one very solid signal.
In this same park I went on to find several old nickels, buffs and even a deep V, several silver dimes, many Indians and even a seated dime, Barber quarter and silver Peace dollar using this method so not quite as hunted out as most believe.
I found them all going after the more solid signals while avoiding about a million others that weren't so solid.
This high percentage method isn't perfect but because I hunt so many trashy sites doing it this way keeps me sane and in the hobby and seems to find me many keepers without a whole lot of extra, useless digging and spinning my wheels.
I had to learn the language of my detectors very well to have this much success, however, and BTW a lot of my gold and many other great treasures were found with the F2 and sniper coil, (which I notice you also have), using these same rigid rules.
Just one way to do it but the way I prefer.