GX-700 Manager by Ninjaw P.B.
Download

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It is located on EVERY Aminet ressource site...so, if you can't download it...try any other aminet site over the world... they are a lot!
     gx700man.lha         mus/midi      445K  Roland GX-700 Guitar Effect MIDI manager

Ok for PC lovers, I designed a simple ADF to boot on it, using WinUAE, the amiga emulator: