Years and years ago (1996) I made a CSound script, with the control rate set to the same frequency as the audio rate, and used it to generate FM Karplus-Strong. A sine wave modulating a Karplus-Strong string model's frequency.

I swept the modulation frequency through the experiment, while generating regular impulses to pluck the "string" and there were indeed some quite snare-like sounds in the more dissonant carrier/modulator relationships - i.e. where the ratios were more like 32:31 than 5:4. The carrier being the KS string model and the modulator being the sine wave.

If you're doing everything with vd~ then you can emulate this. I think I still have it on one of my hard drives, but I don't know which or where. I'll try to dig out the audio tomorrow...(today? for some reason I am awake at 6am) and possibly even the CSound orc/sco files !?!?!

Cheers,
Ed


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From: Alexandre Torres Porres <porres@gmail.com>
To: Jonathan Wilkes <jancsika@yahoo.com>
Cc: pd-lista puredata <pd-list@iem.at>
Sent: Saturday, 31 August 2013, 5:38
Subject: Re: [PD] karplus drum?

I'm not gonna go through the paper at all anyway, I couldn't and shouldn't...

but I've just finished implementing in Pure Data a patch from that Max forum... seems to be working, but the "drum" part, as it says, it's only

"modulating the feedback so that it alternates quickly between either  +1-1. different frequencies of modulation create different sounds, with high frequencies sounding a bit like a snare" 

it's true, but I know you could also make some bass drum sounds, as I've seen in here https://ccrma.stanford.edu/~jos/aiff/ksdrum.aiff

what interests me, nevertheless, is learning new tricks and tweaking the values so they sound more bizarre of course.

cheers


2013/8/30 Alexandre Torres Porres <porres@gmail.com>
here's the original paper by the way



2013/8/30 Alexandre Torres Porres <porres@gmail.com>
Hi. There is a modification to the algorithm that makes it sound more like a drum. Here's a topic about it


gonna try and translate it to Pd, but wondering if anyone has ever done it already ;)

cheers


2013/8/30 Jonathan Wilkes <jancsika@yahoo.com>
On 08/30/2013 05:04 PM, Alexandre Torres Porres wrote:
hi there, anyone knows of a drum made of karplus strong implemented in Pd?

What kind of drum?  For a snare it's just a matter of choosing a low-enough frequency,
then probably slapping on some reverb and other little touches to make it more
interesting.

I think it's just a matter of starting with a Pd implementation of Karplus-Strong and
tweaking the variables.  And depending on the type of drum, you can get a lot of
variety from tweaking the shape of the decay-- that is, how you attenuate the "chunk"
of noise before you feed it back in.

-Jonathan


thanks


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