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D50 Librarian <<< is the best editor. Two types of editor - a virtual pg-1000 (which has it's uses) or a far more suitable computer style editor. Yes it does bulk load/save of banks/patches.
There are loads of sites out there with thousands of d-50 patches including all the factory originals. I have them here but I think google should find you what you want quick enough! if not try joining the D-50 yahoo group - think it had a whole directory of banks there.
ANd.. the price for the PG-1000? rip off! and isn't as great as people say due to the multi function sliders and how they don't update themselves (not motorised or endless encoders) between patches/partials.
Congrats on the D-50. I've had 2 still got one. Love it
BTW the factory patches aren't amazing, very of their time. Famous but??? Seek out the great custom banks that make it sound so warm, analog-esque. There's a great bank posted on vintage synth forums (search) which all use structure mode 1/2 -i.e NO PCM/SAMPLES (which is why the D-50 is so great, it doesn't need to use those dated/tiny PCM bits)
Here are some GREAT patches for this synth:
http://www.vintagesynth.com/forum/vi...58933&start=60