[sdiy] ASM-1 VCO questions--it works!!!!

[Andre Majorel]

On 2003-03-24 00:11 +0100, Magnus Danielson wrote:
> From: Andre Majorel <amajorel at teaser.fr>
> Subject: Re: [sdiy] ASM-1 VCO questions--it works!!!!
> Date: Sun, 23 Mar 2003 22:25:12 +0100
> 
> > On 2003-03-23 21:01 +0100, Magnus Danielson wrote:
> > 
> > > Bon soir Harry,
> > 
> > Bonsoir (it's one word).
> 
> Oh... it's over 15 years since I had my last French lesson, so I think
> a little slip in the spelling is to be accepted, now is it? ;)

Ha ! Let me make this perfectly clear : given the state of my
Swedish, I wouldn't *dream* of criticising your French. :-)

> ... but I thought I bored the hell out of people with my formulas...

They're a bit hard to follow sometimes, but this is not
rec.humor.jokes or rec.writing.cliffhangers.

> > The drum synthesis demo is at
> > 
> >   http://www.teaser.fr/~amajorel/misc/dr.mp3
> > 
> > It would probably make a real drummer laugh, but I feel it's not
> > bad for a 300-line program that was hacked together in an hour
> > or two.
> 
> No, not bad under the conditions... but one of the things that annoyed
> me with that discussion where:
> 
> 1) The loss of the modes where not given, but I know they vary. The
>    loss of the modes translates into the speed of decay.

In this sample, the decay rate is proportional to the square of
the frequency. I've read it's the general tendency in natural
sounds. The actual relationship is probably more complex.

> 2) When you hit a drum you will not induce equalently amount of energy
>    into the modes. The energy-insertion depends on position and size
>    of the drumstick.

True. If you hit a node, I don't think the corresponding partial
will ring. As guitarists know.

> 3) Dampingmaterial on the drumskin (the soft hand damping for
>    instance) will effect the loss of modes, and is also positinally
>    and size dependable.

And shell resonance, bottom skin, etc.

What I like least about the simulation is the attack. I suspect
that a short burst of noise is needed.

-- 
André Majorel <amajorel at teaser.fr>
http://www.teaser.fr/~amajorel/