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Along with editing patch parameters within a Sysex file, the D50 Librarian also supports the editing of a patch within the D-50/D-550 in real-time so that you can hear the difference as you edit the patch.
There are two built-in real-time editors:
The VPG-1000 is a virtual version of the PG-1000 MIDI controller that was released back with the original D-50 and D-550 as a means of editing patch parameters in real-time. It made the editing of patches far easier than via the built in menus.
This version faithfully recreates the original PG-1000 as well as offering a few new enhancements
An alternative real-time editor to the VPG-1000 which allows more parameters to be edited as well as extra editing facilities. It uses the same graphical user interface as found on the Sysex file window: