JH. Analogue Physical Modelling Experiments
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Credits: Thanks to Yamaha for the wonderful VL7 and for
their interesting Patents about Physical Modelling, to Julius Smith for
the theory on which much of that is based, and to Ian Fritz and Ron Berry
for their published analogue physical modelling experiments.
So I wanted to make my own experiments, and before I start to build some
circuits especially for PM, I tried to patch together what I already have:
The VC Delay is provided by the Storm
Tide Flanger, and the nonlinearities are created with a Diode
Waveshaper. As my Waveshaper
Panel also includes a Trapezoid Envelope Generator and a (Buchla Clone)
Low Pass Gate (VCF/VCA) I used these to articulate the sounds. Any similar
ADSR, VCF and VCA modules could be used. My plan is to make a Modelling
Module to be integrated into a MOTM
system.
I'm playing the sounds from the keyboard of a CS-50 with a 1V/oct CV.
The CS-50 also provides some noise in some of the samples. But there are
no VCOs used in these patches - what you hear is all self-oscillating
delays and filters. The sounds are not perfectly in tune, and sounds
which resemble real instruments are mixed with ugly, un-natural sounds.
It's all done in real time, changing the nonlinearities on the fly with
trial and error - no real modelling of reeds or lips yet.
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For more information, please contact
Juergen Haible
Copyright J. Haible (C) 2002