Forums > MaxMSP

Physical Modeling: Guitar, Piano, Bass

April 6, 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!


April 6, 2014 | 11:35 pm

edit

server crashed


April 6, 2014 | 11:40 pm

Hi
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.

https://ccrma.stanford.edu/~jos/pasp/Karplus_Strong_Algorithm.html

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. –

Sorted.

Brendan


April 6, 2014 | 11:46 pm

ps

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


April 7, 2014 | 6:02 am

Thank you so much for your help!


Viewing 5 posts - 1 through 5 (of 5 total)