CAJUN ACCORDION DISCUSSION GROUP
That should be or an "HMMM".
mmmm ... if you shut off the H and the L, wouldn't you get almost the same sound? what's the use? seems like a waist of reeds to me.
Because you tune the reeds differently.. ie a couple cents up or down. -5, plus 5, plus 10, one at 440 etc or one down at 5, two at 440, one at plus 5