The Voice Character Emulation function is a new feature used with Ketron's voices. It adds nuasance to voices such as Sax, Guitars, Flutes ... etc to bring them to life. These sounds copy the characteristics of the associated instruments e.g. clicks and breath of Sax, frete noises and slides of guitars ... etc.
In PROGRAM mode or if you EDIT a PRESET VOICE, you can turn this feature OFF by deleting it from the Voice menu ... not sure why you would want to though. In many cases, these voices are played/added automatically by AUDYA depending on which key was just pressed or in anticipation (based on chords) on which key you will press ... pretty impressinve AI going on here...