[sdiy] Syncable digital noise source.

[Jim Patchell]

http://www.noniandjim.com/Jim/synthmodulesII/200-1021.pdf

This is a noise source I did a few years ago...and yep...put a reset 
funciton on it...but that is partly because I can use the noise source 
to also generate random control voltages...(single step or use a very 
low frequency clock)...for that purpose...the reset is quite useful.

Tom Wiltshire wrote:
> Hi all,
> 
> I mentioned the noise source on the Nord Lead 2 a couple of weeks ago . 
> This allows you to reset the LFSR to a known start state. This means you 
> can sync the noise to an oscillator. According to Clavia, a given LFSR 
> sequence gives fixed formants in the frequency response. They've got a 
> nice diagram of it on page 40 of the manual 
> (http://www.clavia.se/products/manuals.htm).
> 
> Anyway, since then, I've tried putting a reset input on my PIC noise 
> source. Then I fed a squarewave from an SH101 into the reset input. The 
> result was not worth the limited effort, in my opinion. Whilst the 
> formant-shaping produces noise with certain "flavours", it didn't 
> produce much that sounded good to my ears. Obviously you can start the 
> LFSR in many different places and get many different flavours, so 
> perhaps I didn't explore enough. I wasn't encouraged to by the results I 
> got. The sound isn't pitched enough to be really useful, and as 
> unpitched noise goes, pure white or pink have a smoother quality whilst 
> the synced noise often sounded "spattery" and uneven.
> 
> Does anyone have a Nord Lead 2? Do you use the sync'ed noise much? Do 
> you like the sound? Is this a simply aesthetic dislike on my part or 
> does it just sound nasty?!
> 
> Thanks,
> Tom
> 
> 
> 
> 
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