With whistles there are many differences. Some have more room for variation in how loud they are. For example my Copeland can be played very soft or fairly loud, same for my BUrke and to some degree my harper. My Shaws are NEVER loud. My Silkstone has less variation than the copeland but more than the shaw. My Generations whistles I can not control the volume. It is best to pick a whistle that is about the volume that you need for the situation you are playing in. That said, on the low end you could have Clarks for soft, and Generations or Feadog for a little louder etc. OR spend a ridiculous amount of money as I have for "penny" whistles.