It's a fair question. Out of an abundance of caution I just toggled it. Definitely on. In fact, in doing so I have today noticed some correlation between swapping between Shazam and Soundhound and mic behaviour. That is to say, Shazam appears to hog the mic and not relinquish it to Soundhound upon request. If all apps are quit, then I launch Soundhound, I can get a response. But if I happen to then use Shazam, which always works, Soundhound fails until I do the double quit.