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Set Pitch in Mlys


Questions about pitch control in modal objects and the related parameters pitch and stiffness.
THe modalys doc specifies :

A bi-two-mass can be tuned to a specific pitch [in each of its two vibrational directions], using the (set-pitch ...) function, by adjusting one of the following physical parameters:

For example:

(setq my-mass (make-object 'bi-two-mass))

(set-pitch my-mass 'stiffness0 220)

In Mlys, a specific message containing the @pitch attribute is supposed to control the pitch. In the inspector : the mass parameter is the pitch-parameter. How can we change this parameter via the message box? How can we check that the mass or the stiffness has been modified by the pitch?