Thanks for describing the sounds and their sequence! That helps me out. do you happen to remember the VDI's too? Sometimes I think I am ignoring good signals because of the proximity of iron grunts next to them. Apparently, that's a big mistake.
As of late, I've started digging all substantial iron signals. Turned up a lot of farm tools. No old coins yet (except for a 1939 wheat), but I havn't been hunting much beyond my backyard which was a farm pre-1950.
Silver dimes VDI at 81-83 in my area dirt. Its a very clear sound thats just a little different than a clad dime that still comes in at 81.
Copper pennies and clad dimes sound exactly the same to me, but that 90% silver is the sweetest sound a AT Pro makes!