Hi Wes,
There is an update on new settings coming out in the Australian Gold Gem and Treasure magazine next month.
The frequency setting on the back lcd (manual tuning) has a very limited range, to give you an idea it moves this much --- when we convert it to maximise the range it is --------------------------------------------------------------- and thus it allows getting similar gold like the SDC2300 and also allows working super hot ground with way less noise.
Matt from Ballarat in Victoria has been carrying out a lot of experiments with different frequency settings in enhance and fine gold and has been cleaning up the gold left by others.
Look for Matt Kelava on facebook and check out his videos.