The solutions I learned for getting more dampening while actually covering less head with gaff (adding more mass) are 1 - the inside out loop. These loops can big or small and are easily re-positioned (and easily disposable).
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The second (older) technique is to create little flaps or fins in the tape before placing it. Again these can be big or small - and there can be one or many of them. I've seen it all sorts of ways. Both approaches create more mass and I believe, more movement that significantly increases the dampening effect beyond what is achieve from laying the gaff flat. Long ago, I was always using little folded up pieces of tissue or paper towels and holding them in place with the gaff. These loop or fin techniques have pretty much entirely eliminated my need to do that.
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Also I often find myself backing this pieces of tape right up to the edge of the drum - often spilling onto the rim. Also looking for just as much dampening as I need - but absolutely no more... This is, of course, the kind of adjustability that no pre muffled heads can ever offer.
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And of course, these things can be made as small as desired - and unlike moon gels, never come flying off.
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Personally, I am never, ever caught without a roll of gaffers tape nearby. (And for those unaware - I'm talking about real gaffers tape - not duct tape. which is too thin and light weight and horribly messy)