Of all the small woodwinds from any culture, which ones are known for having the SHORTEST learning curve (for a veteran of any common woodwind) to achieve clean, controlled tones from 90% of playable notes?
Ok, that may be technically vague. I realize certain instruments (at least in their traditional playing style) depend on lots of textured or warbling tones. But it should be possible to get a rough idea of which ones are the easiest to play tones that are acceptable (i.e. not unnerving earsplitting baby crying).