[sdiy] Modding the MKS-3(7?)0 - Looking for suggestions

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On Friday 12 October 2007 10:57, Colin f wrote:

> JX10 VCF is IR3R05 - a cascaded pair of 12db/oct SVFs.
> According to the MKS80 service notes, one filter is an LFP, the other a
> BPF. There is a VCA on there too, so there is no direct output from the
> filter.

There are too rev of the MKS80, the later (rev5) with the same VCF chip than 
the MKS70.

Does someone have the datasheet of the IR3R05, btw ? How easy it would be to 
neutralize the second stage ? I see 4 same capacitors around the chip, i 
wonder if removing 2 of them would do the trick.. That could'nt be that 
simple. 

As for the older roland synth with IR3109 VCF (MKS30 and early MKS80rev4), one 
advantage is that there is no onboard VCA, so its possible to add some boost 
circuit in between (but the sound is fatter on theses older synths, not sure 
its usefull).

NR