I agree with jd, Jason.
I'm not really sure why your fingers would 'snap' after releasing a splitter but regardless, after release it's too late for the hitter to pick up any useful audible information.
My son also throws the splitter and he was definitely giving a 'tell' early on: He always had the ball in a standard 4-seam grip while he was taking signs from the catcher, then he would change his grip in the glove to whatever pitch was called for. When he was adjusting to throw the splitter it was very obvious--especially after an opposing coach was kind enough to mention it to me after we had completed a game against his team. This was a few years ago at Majors LL level, and the advice was very much appreciated.
So, now he takes all his signs with the ball in a splitter grip. In his glove he adjusts to whatever pitch has been called from the splitter grip--if the splitter is called for, he sometimes makes a false "adjustment" in his glove and sometimes he doesn't.
When he realized that opposing hitters and coaches were looking closely to pick up clues about what pitch might be coming next, he started having some fun with that.