Well after much experimenting and a great deal of help from some smart guys over at logicprohelp.com I've managed to get Logic talking to G-Player, but the Mac VSL perf tool does not, will not and apparently cannot communicate with either.
While "to_vsl_tool 1" and "to_vsl_tool 2" etc show up in Logic as usable outputs, there is NO signal being received--and if there is, certainly none is finding its way out, even in thru mode across the board. G-player offers "from_vsl_tool 1" etc, so it sees the perf tool, but I've not yet seen a single MIDI message make its way from the perf tool to g-player, which tells me its not the MIDI setup, it's the tool.
Consider that I went as far as setting up a completely new, separate IAC Bus in the OS X audio/MIDI control panel for Logic (which is how I got g-player to finally respond) but the perf tool didn't recognize anything coming via this. I tried sending MIDI both from Logic and a keyboard. Nada.
This is disappointing. I have a very expensive sound library that I bought for gigastudio--which went under, not my fault--and so I'm left trying to make the perf tool work in a Mac environment with 3rd party apps.
Let me ask a more basic question: Has this Mac Perf Tool actually ever been tested with Logic? If yes, the destination player would have had to have been a standalone app, like G-Player (otherwise how else could it have been successfully tested, right? I don't see how Logic's EXS player + Perf Tool would work). Therefore, who did this test before the Mac perf tool was released and, if yes, did they write down how they got it to work?
Otherwise if the Mac Perf Tool was never tested in a Logic environment, and I'm the first twerp to try this, then my report is: Fail.