What they also can do especially well is resonaKampaña; a variety of interesting drum sounds and other noises of many different timbres can be created on them; some of them sound much like an analogue synthesizer bass or even something almost cymbal- like (!). (Who the @!#?*! really needs a TR-909 for making tekkno? ;-) ) One of the most interesting qualities of hot water bottle resonators in resonaKampaña is that many of their extraordinary sound timbres are not only perceivable in their near- field, but (unlike most other resonators) even remain stabile audible at a distance - this makes of them also a perfect instrument for music therapeutical applications. Particularly well suited for resonaKampaña are ones of the Marigold brand, because these have extremely clear sounds of rich timbres those even function well already at quite low operating ranges.
|To make hot water bottle resonators well usable, a bicycle tube valve
should be mounted at the plug. To do this, its handle needs to be sawed
off and instead a hole has to be drilled into the plastic plug, which should
be that small that the valve just tightly fits into it and remains stuck
after pressing it into the hole with the help of pliers. If the hole is
too wide, hotglue can be used to mount the valve and seal the gaps. If
the bottle has a metal plug instead (uncommon), the hole can alternatively
be drilled into the plastic/ rubber board next to the plug (but sealing
the gaps can be a bit more difficult in this case).
For the valve an easy going type which needs little pressure to open should be chosen; though an ordinary airbed pump can be used to inflate the resonator and no awkward bicycle pump is needed.
|To deflate this resonator later, the handleless plug doesn't need to be unscrewed; to insert an object (e.g. small screwdriver) into the valve is often less awkward. (Attention: With some valve sorts this trick doesn't work, though I recommend to test this before installing the valve. If you got no valves suitable for the trick it is not that bad - also unscrewing the plug can be performed relatively easy with most hot water bottles, although some bottle types need a little more force to seal well when closing them.)|
Important is therefore to urgently prefer sorts with identical and smooth relief patterns on both sides, because every tiny variation in membrane thickness makes them more prone to drift problems and though limits their range of safe operation. It also seems to be important to buy ones of natural latex rubber. Synthetic rubber sorts (e.g. BuNa - often labelled with a "British patent" note) don't only smell bad, but apparently also have way worse hysteresis problems and are less stretchable.
|This is a latex hot water bottle from Pirelli; they are one
of the few companies those produce at least halfway suited ones for reliable
resonators. (In spite of this I would not recommend to operate any resonators
of this kind higher then in a medium 2nd range
for a longer time.)
Some Eskimo hot water bottles seem to be identically with Pirelli. Unfortunately both sorts emit some petrol- like antiprana.
Plastic hot water bottles (I tried a dark blue Fashy one) are
badly suited for resonators; they are only little stretchable (even in
a 3rd range barely more than needed to make their center area turn cylindrical)
and have really bad vibration transmission properties those make them also
of little use for resonaKampaña. (Sound is quiet and rather dull.)
Their material is comparable with the plastic of sit balls and can be inflated
quite hard (which causes noticeable hysteresis - inflating too much makes
the seams turn leaky). I guess it may be a PVC sort, although at least
this Fashy specimen is free of the typical dread chlorine/ plasticizer
antiprana known from other soft PVC, but instead it has a quite mild, rather
styrene- like smell, therefore possibly it may also be some kind of plasticized
ABS plastic variant. (It is a pity that nobody makes hot water bottles
of a non- toxic sort of transparent silicone