Becker Pvc low whistle tweak,
It was 18.00, but I wanted to try it,
these tweaks have made it quite playable & pleasing to my ears.
After taking the mouthpiece ,, that makes up the windway ceiling, I found the windway to be a softened V shape, {smaller part of V goes to fipple} I used a Loctite blu tack stuff to make the wind way more of a a ll shape.
also in the cap that forms the winday ceiling , I marked where the air path was and put some clear sticky back strips of a material similar to stick on pickguards, but thinner. I put on 2 layers.
these two things gave me a much more focused stream of air,, Im thinking of a way to do this with out sticky and makle it permanent,,, but haven't taken the plunge yet.
lastly and I just did this sat,, I formed some "ears" going down the sides of the fipple hole, ala Copeland, {but ghetto

}
I like it. I desire a clean pure sound in the 2nd octave and witht these mods and air control have mostly achieved it,
I wish the pipe wa a bit smaller diameter, more like a Dixon, I believe it would give the low octave more character.
as always YMMV but you may want to try it,, if it doesn't suit your fancy , just pull the stuff off.
Oh, yes the blue tacky stuff looks like crap there on ethe sides of the fipple hole, and may not be quite worth having as it only seems to help very slightly.
Steve
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http://www.youtube.com/user/sjeter61 My tunes , if you're interested