Today mr. Sandro (Ketron) sent the following reply. In my case it did not help, please post your findings !

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Roel,

The problem of the Bass randomly disappearing does’n’t regards the polyphony of the SD1 but just the Retrigger parameter on the Bass which has been left to ON instead of OFFon some Styles.

When in ON position ( only on some Styles ), the Retrigger function may result critical according with the Bass lines which are programmed ( if long or short notes, if playing in between two bars and so on ).

Pls. try to change the Retrigger value on requested Styles and save them again.

I’m sure this will fix your problem.
Pls. inform.

Sandro

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I myself checked with the LUCKY style.
While playing only the left hand it is no problem, but after adding stringvoices (right) there is a problem.

Roel

[This message has been edited by Roel (edited 08-26-2003).]