[sdiy] mm5837 are all over the place!

[Scott Gravenhorst]

WeAreAs1 at aol.com wrote:
>
>In a message dated 10/10/03 7:53:16 AM, harrybissell at prodigy.net writes:
>
><< I did a longer shift register in my Prophet V...
>the amplified noise transistors would have had a
>vastly different amplitude (not digital with rail to
>rail swings) and messed up the factory patches. >>
>
>I really like what happens to the sound of those shift-register noise 
>generators when you sweep the clock frequency.  It has a very pleasant, swirly 
>phasing/flanging/filtersweep-like quality - but also really nothing like phasing, 
>flanging, or filter sweeping.  I'm pretty sure that John Blacet's Dark Star 
>Chaos module lets you do this, and provides a modulation input for this purpose 
>(it uses the old TI SN76477 sound effect IC).  I tried this out when I was 
>messing around with the TI IC, and was shocked at how cool it sounded, although the 
>effective sweep range was not as wide as I would have preferred (using the 
>chips internal noise clock).  Did you ever experiment with sweeping the clock 
>frequency on your own shift register noise generator?

Hey Mike,

I have done so, I use a 32 bit LFSR clocked by a VCO.  I was sort of disappointed, to
me it sounded much like using a fixed noise generator passed through a VCF (LP),
CV=pitch.  I didn't do much more than that, I should have also run that through a
real VCF with rez, and CV=pitch.  I still want to do that.  What I was hoping for was
more of a tonal noise source than it appears to be.  I didn't realize that what I
really wanted was to use a VCO with some noise summed with the pitch control voltage.


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-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
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