I sent this letter to Ketron a week agon..... no answer yet :
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Dear mr. Sandro,

I still am a very happy user of the SD1 (for about 2,5 years) and we do many gigs where the Ketron proves to be the absolute BEST arranger keyboard compared to Yamaha,Roland and all others !

However, since the latest upgrade to 4.0b there are some polyphony problems as you probably know ?

Especially while using string-voices (right hand) often the bass-voice disappears and it looks to me the priority is programmed not correctly. In my view the bass needs almost highest priority.... far above the right-hand chords/voices.

I expect Ketron engineers to be busy with this problem already, but with this email I like to give an extra attention to this point.

Could you please confirm this problem is known and the engineers are working on it ?
My friends from the synthzone-forum have only one problem, THIS problem, with playing- and considering purchasing the SD1.
Solving it will bring Ketron even more buyers/customers.

The last question : Is there an expected release date ?

kindest regards from The Netherlands,

Roel de Jonge