Sweeping siren via 4049 - can't remember how I did it ;X

[synthmonger]

I was toying with a Forest M. CD4049 phase shift oscillator schematic a while back and by placeing things here and there, I was able to get a really cool sounding siren. I wrote down the schematic but I've misplaced it and just can't find it.

Anyone have any idear on how I could re-create this?

I've included a scanned copy of the schematic

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[fluxmonkey]

um, maybe you used the other half of the 4049 to build a second (slow) oscillator, and used that to modulate the first one??

b