Three patches that implement some basic physical modeling with expr and fexpr~.

The explanations I wrote about the calcul are not exact. The V term does not mean speed but is the sum of the forces on an axis. Multiplied by the time delta, it gives the quantity of cinetic energy being transformed into potential deformation energy, over a period of time.

Ammortis.zip

thanks! it would be great to get something like springsound http://www.anckorage.com/spring-sound/ in pd. combining a few spring models in a chain can produce an enormous range of possibilities.

If you're interested by physical modeling, you can take a look on the pmpd external introduced by http://recherche.ircam.fr/equipes/repmus/SMC04/scm04actes/P47.pdf

Pardon my ignorance but I am confused as to what the two outputs are defined as for the expr function? (I sort of understand the first but need some clarification but for the second I am lost)

@mikkejos22 The [expr] family can contain more than one expression.
The object will start with "expr" "expr~" etc and then there is some work done.
A second expression can be added by a semi-colon separator....... the ; means "new line".
Then the left outlet will give the result for the first expression, and a new outlet will be added for the result of each subsequent expression.......
....... eg........

Three new patches. How to make more complex objects.

ModelPhysique2 2.zip

A modal synthesizer

10-modes.pd

I suppose now you can think of writing it in ASM ... in machine ?