I'll sure try it out! I guess in the weekend if I manage to find the time (if time is money, I'm a very poor man...).
I guess the closer you put a regulator to an IC input the better. I see you also put a hefty capacitor on the output too, always a good idea! An 100nF ceramic right on the input pin would be nice too since these LDO regulators require very low impedance sources to regulate properly. Despite its horrendous power efficiency, a simple linear like the 78XX is more immune to this and only require a good amount of capacitance if they are very far from the targets.

Thank you very much for this schematic!!! Now everything is clear as day. I had a suspicion that the symbols/flags were there to help you organize your PCB better or to "remind" you of any off-board connections but I still couldn't figure them out. I guess the fact that my background ranges from radars and other electronic warfare equipment to biomedical instrumentation and not stompboxes didn't help either... Armed with this schematic and a stompbox, last night I realized what you were depicting there and now it all makes sense (even the old schematic).
As far as the opamp goes, well, if you mention an integrated peripheral or device in documentation and the schematic it is good to include a detailed "break down" of your IC, for "informational purposes" as you very well put it. Anyway it's not a very important omission since a good look at the PT2399 datasheet can clear the landscape there too (not the best datasheet I've seen but good enough for this kind of IC)!
Good job and thank you very much!!!

Sorry for not being more "diplomatic" as you said. You are right... I wasn't. Actually I was totally out of line...
Once more, I have to apologize for my complete lack of diplomacy but I got excited when I saw the posting and immediately crashed when I saw a schematic I could not "read" immediately and figure out what is happening... It was frustrating as you can imagine  :grr 
I had to learn electronics from some very "bitchy" teachers and apparently they gave me their attitude (it's true what I said about failing you without a second thought...).
I see that you are trying to help. it is obvious when you put up all this effort to put together the circuit, troubleshoot it, optimize it, and finally publish the schematic and and a result (sound file) from it!!!
But why do all this in a way that makes people asking you questions just to figure it out? My teachers used to say that a schematic, a few pages of documentation  and in some cases a mechanical drawing and a layout (for RF, etc) should be all that you need to build an analog circuit... If your documentation and/or schematic does not allow this, there is something wrong (and you fail the class  )
Thank you for providing your help and answering some of my questions but I could use some more help as I don't I have a clue to all the abbreviations on the schematic and what they mean. I see some of them are probably there instead of "wires" connecting different parts of the circuit since they have the same name (despite the fact that they are not on a bus or something) but others are simply there not pointing to anything... Any help on this will be deeply appreciated!
PS: What happened to that Opamp???

New guy here. Attracted by the PT2399 noise problem improvement I saw. I have a noise problem with my pt2399 circuits (doesn't everybody?) and I learned to live with it, until I saw this posting (a little late I have to admit). I absolutely loved what I heard but puzzled by what I saw. I would really, really love to play with this circuit but the schematic is unintelligible... What are the following:
JB+
JGND
BGnd
JSw
PGnd
PV+
PSw
DEnd
GIn
Ein
DIn
Dry
DOut
EOut
GOut
EchR
FOut

it is always good to explain what you mean when you introduce abbreviations...

Where is the opamp (LP2, shouldn't it be U*??) between pins 13 and 14?

Is BAS16LT3G really necessary or a 1N4148 would do in its place? When you introduce specific components it is good to explain why you need the extra 200mV forward voltage and low leakage current of the specific device over the "generic" type. Same goes for the MCP1804T, why this device to regulate 9V to 5V when a generic 7805 would do the same... If there is a reason for the substitution it must be documented...

Great work but if you had my Electronics professors in college, they would fail you without a second thought...

I am not trying to be judgmental or anything, just trying to say that a schematic that is clear as day to you might be clear as mud to others. When you take the big decision to publish it even on a forum you must make sure it is clear and helpful to everybody. This is why there are rules out there on how to design a schematic. This is why we all use the same symbols for resistors ,capacitors, transistors, etc.

If you clear this schematic up, I would be the first to jump in, play with it and give some feedback on it. This is the main reason, we all share the same notation: collaboration!!!