I enjoy playing whistle and recorder. I find it easy to do tremolo by controlling my breathing, rather than waving a spare finger about, bagpipe-style. The only problem I have is enough to put the mockers on public performance: I can't change register quickly. When you go up (or down) the scale, you get to a point where all your fingers are off and you have to put them al back again PDQ (or they're all on and have to come off, which is not quite so bad), and I can't do it! Of course, people who have heard me play mandolin might say we should be grateful for small mercies ...

Steve