The discrimination knob on the Cointrax Baron changes the break point for the audio tones.  I set it to the 9 o,clock position on my Baron with iron audio on, that gives low tones for iron and small foil, split high/low tones on medium foil and nickels and high tones on everything else.  As most gold rings fall in the foil/nickel range,  having the audio giving the split tone is a constant alert that the target could be gold.  Also, the preset sensitivity on the Cointrax is too high for many areas.  I use the turn on mode, or Demo, most of the time and the sensitivety is preset to 3.  I've found the Cointrax to run more stable by reducing the sensitivity to 5, and even 9 in some conditions.  Very little depth is lost until the setting is at 7 or below.

For those who use the base Baron, ProHunter Baron and possibly the GoldTrax module. If you turn the iron audio off by pushing the disc knob the discrimination range changes. Most medium and small foil will be rejected at 0 discrimination as well as iron. That's good. What is not good is that a large number of smaller gold rings and all gold chains except large ones will also be rejected. I checked 20 small rings and 3 different size chains with my Baron converted back to the Base unit and with iron audio off it rejected 9 of the rings and all 3 chains, even with the 5.5" coil. One of the chains is a 14 kt medium size chain. With iron audio on and disc set to reject nails it hit on all the rings and chains, even with the chains stretched out.

Jbird posted these tips on Carl's old forum.  The two tones of the Barons help a lot.  If you use JB's "Dig em Cowboy" setting of small iron like nails on low tone and everything else high tone, good targets will mostly be clean hi tones with varying strength of signal.  Deeper the target, weaker the signal.  I know the barons give a strong signal even on deeper targets but they will fade in strength noticably below about 5 to 6 inches.  Lots of my deeper finds were just a tiny hi tone "duh".  If I have any sensitivity adjustment left, I can tune that up to a good solid signal at very respectable depths by raising sensitivity.  Of course very small targets at shallow depths can sound like some coin targets at deeper depths.  Breaks of the game.  If you get a hi tone with just a hint of low tone, that may be a low conductive target or one located very close to iron.  A clear hi tone is a target further up the conductivity scale.  The baron is good about giving 4 way signals on targets that are not masked by very close trash but you can't always ignore two way or even one way signals.  Listen to the two tones and if you are getting a high tone chirp mixed in with low tones, you could have a coin or good target in there.  This varies some by site, depending on what the predominate trash targets are and where you set your tone control.

More tips from Jbird.  The CoinTrax and GoldTrax modules for the Treasure Baron are highly adjustable.  The PRESETS work fine under most ground conditions but for fine tuning to more difficult conditions, the adjustments are very helpful.  My experience has been only with the Goldtrax version but it seems to be almost exactly the same adjustments as on the coin-trax  as near as I can figure without having a cointrax to play with.  Im going to ramble on here and hope some of this may be helpful to ya'll.
AUTO GROUND BALANCE: Not just a turn on and go system, although you can do that too. If you just turn it on and start hunting it will ground balance after a few swings but the iron inhibit function is not as effective this way and the AGB tends to track to some iron.  This maybe desirable under some hunting conditions as I have mentioned in previous Posts.
The Turbo ground balance is a more ;precise system of AGB which inhibits tracking to iron.......providing you didnt ground balance over or near an iron target.  These detectors are very hot off the edge of their coils so make sure you TURBO balance over clean ground.
The third method of ground balance is for neutral or very low ground minerals.  This is where you hold the coil in the air, press the mode switch to retune, then lower the coil to a clean spot on the ground.  Use this third balancing system only if the other two systems are not working.
Even though the auto ground balance system sets itself and works fine, I notice that it always ground balances very positive and thats good for most conditions but there are times when you may wont to change that.  The Goldtrax calls this a SLEW adjustment but I think the Cointrax calls it OFFSET adjustments.  You can adjust your ground balance threshold sound where you wont it, negative, right on with just a slight hum or more positive.  This is NOT manual ground balancing.  It is just adjusting the point at which the AGB balances.
If you wont to, you can turn off the automatic ground balancing system and manually adjust to a fixed ground balance.
SENSITIVITY: Having seperate sensitivity settings for the all metal mode and the discriminate mode has some advantages.  When I am setting up my detector, Ilike to find a target to swing over in discriminate mode with disc sensitivity set at preset (thats the knob on the lower left control panel).  Listening to the audio volume in disc, I then switch to all metal and set that sensitivity to sound about the same.  Seems to help me in determining depth of targets as I am hunting if both modes give equal responce.  Of course, there are times when you wont a different set-up and it sure is nice to have that capability.
Concerning depth and sensitivity.  The pre-set point on the disc control gives good depth. Increasing it gives more depth of course but it really starts increasing sensitivity to weak, low conductivity targets (gold chains, we hope).  You can get a very very weak signal, increase sensitivity and make that sucker boom in like a freight train.  You take your chances here as extreme sensitivity can make low conductive rusty iron, especially in moist conditions, sound like a one pound gold nugget.
I dont know if the Cointrax module has the same degree of sensitivity as the Goldtrax but I hope it does.  Running too high sensitivity can drive you bonkers at times but if you learn to adjust it to the site and conditions you are hunting, its a very valuable tool.
STABILITY: In my opinion, this is where these detectors shine.  They hold pretty steady at max power in bad hunting conditions.  They discriminate better at depth than some detectors I have used, the 1266X, for instance.  Their depth capabilities while remaining stable gives me what I call USABLE DEPTH.
AUTO-TUNE: Preset is pretty fast, too fast for sizing and shaping a target, but with a few clicks of the buttons you can go from all metal with no retune (except tapping the retune switch) to slow to extremely fast autotune which is tuning out a target almost before you hear it.
COIL SWEEP SPEED: May be different from your other detectors and fairly important to get the full potential of these machines capabilities.  Gets a very sharp target signal a very slow sweep and discriminates better.  I have been sweeping a little too fast and got a squeak of a signal, went back and checked it and got a bang up good signal.