[sdiy] Percussion MIDI controller - again

[harrybissell]

I'd try a bar of something quite rigid (so that all the resonances are
high in the audio range) and then support it from each end in a can
of jelly (like RTV) so that any waves that get to the end are heavily damped.

Wonder if there is a way to pick up just a surface acoustic wave and not even
see main resonances ?

OTOH if you use a bar of steel (which would probably work real good) it would
suck to hit it with a stick.  Early Simmons pads anyone ???

H^) harry

Ian Fritz wrote:

> At 04:55 PM 3/28/2005, Paul Perry wrote:
> >The idea of a triggered one-shot holding the input off for a certain time
> >should overcome the reflection problem, but you might also beat the
> >reflections in two other ways:
> >
> >1. if it is the air column in the pipe vibratign, stuff it with speaker
> >padding (or a towel!) the tighter the better.
> >
> >2. if it is off the ends of the tube itself, you can cut a diagonal slice
> >off each end (as long  a slice as possible, say a foot long) so that
> >the 'end' of the tube is spread over a length, which causes the
> >resonance to be dulled out. (you are giving the tube a lower Q!)
>
> Good suggestions, both.
>
> Another (similar) method would be to cut transverse slices of increasing
> depth progressing beyond the main tube length. Or drill a bunch of holes
> ... anything to randomly and incoherently scatter the traveling wave.