[sdiy] Modulation waveforms

[Scott Nordlund]

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> Date: Mon, 5 Jul 2010 11:44:05 -0500
> From: nathan at woosteraudio.com
> To: gsn10 at hotmail.com
> CC: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] Modulation waveforms
>
> On 7/5/2010 10:38 AM, Scott Nordlund wrote
>>> Great paper, I like the idea of the random slopes. I don't think you
>>> could get that behavior with a slew limiter after the LFO.
>>>
>>> Another waveform that I like to play with is the random walk (a.k.a
>>> brownian motion); you randomly change directions instead of randomly
>>> change values.
>>>
>> Random walks are unbounded, so this presents a little bit of a problem.
>> It should reverse direction at the boundaries rather than overflow or
>> saturate. More interesting (not to say useful) would be to put it
>> through a sine (or other) waveshaper.
>>
>
> Yes, that's true. Another option is to increase probability of changing
> direction as you get close to the edge.
>
> Nathan

I've tried that.  I have a back-burnered project that recursively 
multiplies or divides a frequency by a random integer, resulting in 
a stream of harmonically related tones, without following any fixed
scale (it sounds alright but needs more stuff happening to really be 
interesting).  This can quickly go awry so it needs some sort of
probability shifting to keep it in bounds.

It works but it's hard for me to gauge whether it's really working
as it should.  Messing around with random distributions if you don't
know what you're doing can get pretty weird.  

See the comments: http://thedailywtf.com/Articles/Random-Stupidity.aspx

I know this is a particularly stupid scenario but I still like to 
keep things simple so I can have some fairly lucid understanding of 
what's going on.
 		 	   		  
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