HI Rikki

Providing the VST interface can load and save Multi then there should be no problem using them in real time. (The number of sounds that can be stored in a Multi is determined by the amount of Ram you have)

If you have to load each sound from the disc when selected, then real time is not an option.

Interestingly Kontakt can load Multi but Kore can’t. (At least I haven’t found out a way to do this yet)

Another one to have a look at is Independence by Yellow Tools http://www.yellowtools.us/cp21/cms/index.php?id=3 which also does Multi.

Regards

Bill