AW(2): VC delay module ideas?

[Ian Fritz]

Well ... it depends on what you want. The fixed filter case would
correspond to a "slide" instrument, as in "slide clarinet". In a real
clarinet, though, the return reflection is off the bell for the very
lowest notes, but off the first open tone hole for other notes. So the
reflection/transmission characteristics are different for different
notes. This explains, for example, why there is such a pronounced timbre
change going across the register break. If you have had a chance to play
with the programming of your VL you have probably found that many
parameters can have multiple "break points", i.e., they can be varied
with frequency. By the way, I remember from discussions on the wind list
and from reading the programming guide for the VL that tuning the
instrument across a wide range is quite tricky. This fact, plus issues
similar you are worrying about, is why I started thinking about
abandoning the delay line approach in favor of a timing approach, as I
have mentioned a couple of times previously.

  Ian

___________________

jhaible wrote:

> I think for this PM stuff we need a filter inside the delay that is *not*
> tracking, with the whole system still producing the properly scaled tones.
> Correct me if I'm wrong, but things like how much of HF and LF end is
> absorbed or reflected in a waveguide should not depend on the pitch
> you want to play (i.e. length of the waveguide), should they ? As far
> as I know (and that's not much in the PM case) the whole thing gets
> its life from interaction of parameters that are partly fixed (properties
> of the wood or metal, shape of the end of a tube, ...), and partly
> variable (length of waveguide, ... ? ). Otherwise we could almost as well
> use a sampler and simply transpose the sound.