This soundfont is in the .gig format, and is made with the samples recorded at the Electronic Music Studios of the University of Iowa (USA) Except for cutting the silence before the attack, the samples were not modified : natural scale of the instrument, natural sound, natural sustain and release, as published by the EMS, UoI: no loop, no effect.
The samples are publicly available as is, with no license, as far as I know. My warm greetings to the nice people who maintain this usefull project! Please check their home page for more details: http://theremin.music.uiowa.edu/MIS.html# And donate if you can.
This soundfont is released under the WTFPL, Version 2.