[sdiy] Legal issues of cloning

[Bob Weigel]

On 10/7/2013 9:39 AM, Florian Anwander wrote:
> Hello
>
> > Roland had to change their filter for instance.
>
>
> Do we really know that roland had to do so? Or maybe Roland wasn't 
> keen any longer to pay the patent fees?
>
> The history of the filters is quite interesting:
>
> The SH-1000 started in 1973 with the diode ladder filter.

Correct
> In 1974 came the SH-3 still with the diode ladder filter, 

Maybe I've been told wrong.  I haven't actually verified what my 3a has 
in it but I think it's another Roland design and the 3 had the moog 
filter from what i've been seen in all references so far.