Believe there's a drum editor for the LM-4 not to sure on the LM-7 tho. You could still edit its preset files by hand. for example open up the 909 one with a text editor and you will see the sample dir, file and names.

some other alternatives (free)

http://userpage.fu-berlin.de/~thman...st-allinstr.htm

or this one made for Computer Music by Muon

http://www.muon-software.com/html/sr202.html

becareful with Muon tho, the guy got a lot of shit a few years ago for releasing a vst (think it was is free 303 clone) that would scan your folder and delete anything it considered as being warez