What Windowsversion do I need to run JMP-Editor?

So far I had the chance to test JMP-Editor on Windows 98SE, Windows ME, Windows 2000 and Windows XP. As far as I can tell it did work well on all of them (though I have to do some tests on the ME and XP maschines).

What MIDI-Devices does JMP-Editor work with?

Device/OS	Win95	Win98	Win98SE	WinME	Win2K	WinXP
M-Audio MIDISport Uno
Terratec PCI128i
Creative Labs Soundblaster 16
Creative Labs Audigy 2 ZS

Note: this does not mean that those devices do not run with JMP-Editor under other OS-Versions, these are only those I can confirm!

Will there be a Mac-Version?

Not from me.

Can JMP-Editor tweak the JMP-1(e.g.: giving Gain value of 25)?

I did not try that... and will not try it.

Where does JMP-Editor store the Path, MIDI-Out Device etc.?

These settings are stored in the registry:
HKEY_CURRENTUSER\SOFTWARE\Marshall Amplification\JMP-Editor