Hiya mate, ok lets tackle things one at a time.
Volume gain: set this to 30
Recovery deep: turn this off
Read this thread to understand my thinking, the initial post is copy and pasted from Minelab.com engineer who wrote this to explain how "recovery deep" worked and when it should be used, the blog came about after a few of us emailed them the query.
http://www.metaldetectingforum.co.uk/vi ... =98&t=4123
Volume gain at max does more good and uses less process power than recovery deep on.
You say you had a few iffy signals that you didnt understand, i think the reason for this is using "2 tones"
Basicaly you have told your machine to put all targets into 2 areas.
The problem this creates is the "cut off " point at which the machine will go from "iron grunt" to "diggable signal" is quite high.
What i'm trying to say is you may have a target that isnt fully iron, or is so close to the "iron grunt" cut off that the machine isnt sure which area to put it in.
If you change this to "4 tones" then you may find the "iffy" signals will fall significantly.
Basicaly by using 4 tones you lower the "cut off" point for iron, and assign anything above this as a diggable signal.
So in 4 tones you still get and ignore the iron grunts, but you have 3 tones that are diggable signals.
If that makes sense.
I dont suggest using multi tones yet as they will do your head in until you get used to the numbers.
Try to keep auto sensitivity on +3 if you can.
Also make sure the sensitivity on that same screen is set to 30......its not a proven fact yet whether this has a bearing on the level the machine will set itself to, but it does no harm to have it set at its max.
If when on a field your auto sensitivity is hitting the high 20's, then try switching to manual and setting the senisitivity as close to the auto level as you can, it will increase the depth of the machine.
Using auto the machine filters the 3 channels and sets them the same, where as manual will allow the 3 channels to work more efficiently....
Only start using manual sensitivity when you are comfortable with the machine in auto, it does turn the Etrac into a different beast.
To start learning the numbers then collect as many things as you can that you are likely to find and set the machine up on a table outside, without the stems.
This way you can hold the coil and wave the object under it whilst still reading the numbers on the display....
Hope this helps....