Ran out of time to edit my post. There are actually two other ways to rig a remote PP to the stock switch, but they both have problems with either not being able to retain the Disc Iron Mask ON or OFF modes to flip back and fourth to, or the other method would risk the stock switching being in Iron Mask OFF mode while you forced it to All Metal PP mode, with both being a complete circuit inside the GT at the same time. Who knows what that might do, but I don't want to risk finding out. Thus why I set it up the way I did.
And if I didn't make it clear, with the remote PP plugged into the stereo jack or not, the stock switches still retain full stock functions for use. It's just that if the remote PP switch is pulled backwards towards my hand (in the way I mounted it) it would bypass the stock disc switch completely and turn control over to the All Metal switch's setting, whichever you have that set to on the GT.
I wanted the remote PP mounted so when pulled towards my hand it would go into one of the All Metal modes, so when thrown forward and away from my hand I'd be less apt to bump it during most of my hunting time in disc.
The PP function on the GT has some serious potential abilities. Not only to see deeper than the legendary ability of BBS disc, but also to punch through harsh minerals that even BBS can have issues with. Many PP users say full volume/full sensitivity will give PP mode the depth of top of the line PI units in the worst of grounds. Even with sensitivity set at what is stable for disc, and even with volume at it's lowest, at one particular badly mineralized beach I found PP mode was easily seeing coins at 4 or 5" that disc was either choking or completely nulling out on due to the microscopic iron, black sand, and other minerals in the sand. Blew my mind, and made that dead beach wake up like I couldn't believe with targets. In no time I had a pouch full of coins, where as double the amount of time than that hunting in disc that day before hand I had little to show for my efforts.
Many say in PP mode sensitivity can run at full blast with no stability issues even in bad ground. I have played with that and it appears true, and also it does appear full volume on my GT gives more depth than lowest for PP (but has no effect on disc when I've compared lowest/highest volume). I've long heard many say full volume on the Sovereign increases the depth of disc, so I would suspect that's true on prior models, as I do see on the Excalibur when I've toyed with it that full volume does give disc more depth. Just not that I can see when precisely measured in disc mode on my GT.
I have big plans for PP mode this year. Not just using it on beaches when targets are scarce to punch deeper or to see even shallower stuff disc can't, but also for use on land at some sites that are low in non-ferrous trash but have the potential for some deep old coins out of the reach of non-PI units. Even if there is a bunch of iron present, I can already often tell what iron is by way of how it reacts in PP. It'll either be fuzzy at the edges, have a wider approach and leaving response to the target, or will only sound off one way (approach or leaving it, either one). I'm hearing there are about 10 other words in PP to judge targets by, so I look forward to learning that. My game plan on land when I use it is to only go after targets that I suspect aren't iron by their response, and also that sound soft enough to be out of the range of typical detectors but not this "PI-like" mode on the GT using PP.
One handy thing about having a remote PP is that on the beach you can flip back to disc and see if it sounds off or is nulling like iron. Based on it's depth if it sounds within range of disc *for that beach* and you get no response, then chances are it's iron. On the other hand, you can scoop out the sand and once PP says it's on the beach dumped out now, flip over to disc and if it nulls then it's iron. Some guys will then just re-fill the hole without recovering it, leaving it for the PI guys.
I don't like to do that if I can help it, because way I see it one last piece of iron in the sand means one less chance at it masking something or me digging it up next time.
But for land using this reverse disc thing- If I flip to disc and it sounds off and is trashy, then it's not out of reach of other machines so I might pass on it. By concentrating on only the deepest of whispers that don't sound like iron, and also conversely won't sound off when flipping to disc due to being out of range, then I am targeting only stuff beyond "where no man has gone before" so to speak.
I'm going to continue to play with this PP thing to compare to the Deeptech units. Both are very similar in abilities in many ways in terms of ultra depth, so if I can see extreme depths on coins somewhat matching what I'm seeing video wise with the Vista units, then I won't feel the need to add one to my arsenal, since PP mode is pretty much giving me the same abilities (IE: ability to tell iron and ability to go very deep). Those units are limited in discrimination to right around just above iron, so with PP's ability to signal iron, if the depth is similar then I won't see a need to get one for these particular specific land hunting situations- Low non-ferrous trash but may have high amounts of iron, with the potential of some very deep coins at such a site.
By far though those units have some very good fine gold sensitivity for thin chains and such, but that's not of primary importance to me. I mainly go after old coins, or when beach hunting I'm after gold rings, since they are IMO far more numerous in the form of what is to be found gold wise. The GT will bang at super depths on low conductors just like it will on silver coins, so long as they are an intact loop. I'm working on another video right now to show this, like the one I did with a woman's wedding band.