There is a new version of MIDIQuest XL that just came out.
MidiQuest has always advertised that it was a true midi librarian/ editor for external synths but I could never get it to work with all of my synths.
I was told by their tech people that MIDI & Linux/OSX don't like each other. Sys Ex messages were very finicky when interacting with the OS. I guess it was true because it never worked as well as my old Galaxy Plus Editor (which only ran under OS9.)
Apparently, they've re-written their program and it is out in Beta now. IN fact, it can be loaded up as a AU plug-in. I have not had time to try this out with L8 as I am still migrating all my plug-ins to a new mac pro.
I do know that the company is looking for feedback directly from Logic users.
They gave me a user name & password to download the beta because I was an existing client.
But I'm sure they would want to give the beta out to some of us because they want they Logic users to buy the release...