The Intellitouch has the facility of being programmable which suggests that you can preset either a different tuning into its memory (eg DADGAD) or a different pitch (for perhaps an old flute which is tuned below modern concert pitch) which it retains in its memory until you alter it.
I've never had any problems with one in a fairly noisy situation but I don't know what it would be like in a concert with a rock-band for example where the whole guitar would be vibrating with the overall noise level!!!
Dave