[sdiy] wave/surf machine

[Simon Richardson]

>> It was somewhat artificial, but if you ban natural sounds for some
>> reason that's the price to pay.
>
> to build onto that idea, one that would work a bit better, and maybe 
> sound a
> more realistic. instead of an LFO controlling the volume, you could 
> have the
> volume of the noise source controlled by an AD Env, which is triggered 
> by a
> normal clock circuit... might sound a bit more realistic than noise 
> fading
> in and out.

The most realistic surf sound I have found comes from sweeping a tilt 
tone control over white noise - in effect you sweep back and forth from 
red through white to blue noise and back. This is very different from 
playing with the volume.

The tilt control goes back to the famous Quad amplifier in the early 
1970's. Versions of it are here:

http://members.tripod.com/roymal/ReverbTone.htm

and look at figure 10, here:

http://www.headwize.com/projects/showproj.php?file=equal_prj.htm

Both of these use fancy op amps but I'm sure a TL07x would be good 
enough. Unfortunately these are manual tone controls, you will need a 
voltage controlled version that does something similar. The sound is 
very realistic.

Simon