[sdiy] Does anyone have the Roland IR3109 datasheet? (looking into sh-101 filter modification)

[Florian Anwander]

Hi Samppa

> What if You fed pre- and post-filter signal to a differential
> amplifier (with a phase and level considerations)?
I did it testwise with my JX3P. The result does not really sound like a 
highpass filter, but more like some hipassed phaser sound - nevertheless 
it might be worth doing it in a SH-101.

Florian