What I know is I would have to use EXMP. A dos program that does not do batch conversion on EII files. So One by one, wave sample by wave sample I would have to tediously convert
EMXP can perfectly convert a batch of EII files to WAV files at once, you really don't have to convert sample by sample.
In EMXP v3.07 the batch conversion can be done as follows:
1/ In the main menu, select "1. Manage EMU Files and Disks"
2/ Select "4. Manage EMU EMULATOR-II Files"
3/ Select "1. Manage EMULATOR-II Bank Files" (if you would like to convert .EII files)
4/ Select the EII files you would like to convert. You can select multiple files. If you want to convert *all* files in the current folder, simply press "A". After the files have been selected, press the "W" key (or press Enter and select "3. Extract all samples to WAV files")
5/ Choose "1. Yes, extract samples as automated as possible"
6/ Select a target folder
EMXP will now convert all samples of all selected files to WAV files.
BTW: EMXP is not a DOS program, it's a Windows XP/7/8/10 program but it has a look & feel of a DOS program