<https://www.concertina.net/forums/index.php?/topic/25517-duet-playing-practice-question/#comment-223114>
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"This problem isn't inevitable. I've had four Crabb Cranes in the past (two cheap 35 buttons and two more expensive instruments). None of them suffered this problem. Why? Because the Crabb family actually played Cranes and so realised how to set them up properly. Most other makers and restorers don't.\n \n\n\n\t \n \n\n\n\tTry this. Hold down a bass button and a treble button at the same time with no pressure on the bellows. Slowly start to press (or pull) the bellows. Which note sounds first? If it's the low note (and if that's true across several different buttons) then the reeds need re-setting and/or re-valving so they all start to sound at the same pressure.\n \n\n\n\t \n \n\n\n\tYou might still need to adopt some of the other playing techniques as well, but a properly set-up instrument will give you a head start.\n \n"
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