The interrupted NRPN value means that, there being no 14-bit negative NRPNs, the value that goes to the computer (or synth) may be listed as "-7 to 7" for example, but will show up over the cable as 16377 to 16383 and then 0 to 7.
"-100 to 100" would actually be 16284 to 16383 and 0 to 100. No continuous track of numbers to assign to a single pot or fader. You have to split the flow into two different steps, either two separate controls in one map or two maps for the same control.
There is a comprehensive spreadsheet of Micron NRPN values available in the download area of the Yahoo! Micron/Ion/Miniak user group. Here is a link to the spreadsheet in my Dropbox Alesis Micron NRPN Spreadsheet PDF
. This is greatly expanded from the severely incomplete spreadsheet that is available from the Alesis company download area.
The Novation Remote controllers also can transmit 14-bit NRPN values. There are surprisingly few MIDI controllers that can. Most are limited to 7-bit CC and NRPN, quite useless for the Micron. Adequate for most VST I imagine. For the interrupted Micron values, I set up one Remote page for the lower values and another for the upper values. Going from one to the other requires only a click of a dial to change the page. It is not perfect as the switch leaves you at whatever value you were at when you last accessed that page. Usually it is continuous since being in the lower, for instance, means that the upper was last at 0, or vice versa meaning that the lower was left at 16383, so it isn't much of an interruption and usually not a jump. Aside from writing a completely customized software control interface, I have not found another way to gain knobby access to the Micron's interior.