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Physical Modeling: Guitar, Piano, Bass

Apr 06 2014 | 2:36 pm

Hey everyone!

I am in a beginner max/msp class. Our final project is to do physical modeling of guitar, piano, and bass. My partner and I have been working on this constantly for the last week and a half, and have gotten nowhere. We were looking at using biquads~ to make filters, but our class never covered it, and it seems like there is an easier way to go. My main questions are:

Why is it when we remove the biquad, no signal is passed through at all. Biquad is just a filter, right?

The biquads appear to be controlling most of how the timbre of the guitar is formed, so is there anywhere that talks about piano and bass parameters for a biquad, or what is another way of forming these timbres? I feel that the filtergraph~ and amplitude envelope don’t have as much of an impact on the sound.

Once in a while, our sound stops working even when we won’t change anything about the patch. Anyone see a solution?

Check out our patch, and any help would be greatly appreciated! Thanks!

Apr 06 2014 | 11:35 pm


server crashed

Apr 06 2014 | 11:40 pm

your feedback algorithm was incorrect, causing infinite feedback – and the [dac~] was shutting itself down.

I also think [biquad~] is a little heavy-handed for string modelling. You’re tutor may disagree but I would favour [onepole~] for the string and several [reson~]’s for the soundboard.

J Acous Soc Am
106/5 1999
T.D.Rossing G.Eban
Normal Modes of a radially braced guitar determined by electronic TV holography

And the science:

donald e hall
musical acoustics (2nd ed.)
California:Brooks/Cole 1991

-- Pasted Max Patch, click to expand. --



Apr 06 2014 | 11:46 pm


Just type "Karplus Strong" or "physical modelling" into the search box up there. Endless resources.

Apr 07 2014 | 6:02 am

Thank you so much for your help!

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