[sdiy] Roland Filters / IR3R05

[Marc PAILLER]

> Personally, I find the 3R05 implementation less pleasant than the 
> standard cascade and I have been wanting to play about with the cap 
> values to see if I could improve it. Its interesting that the SSM2045 
> does vary the cap values from what simple theory would dictate to give 
> them an 'open rich sound' as their datasheet says.
> 
> Cheers,
> 
> Tony

Very interesting, as i have a MKS70 and always find myself wanting to mod it.

Since the juno-6 seems to have a nice full sound dispite its DCO, i was starting to think that to add some fullness to the sound of the MKS70, it would require some J-fet booster circuitry to each voice (pre or post IR3R05, that's the question).

So this idea changing the cap values is another possibility to explore. I will look at the datasheet to learn more.
Another thing interesting to me, would be to add some circuitry to bypass the first 2 cap, to provide a 12db/oct only mode wich is always nice for the pads.

JPP