whan i play in left hand only bass+lower+hold st, (4 in mode style)
the bass play good but whan i Leaves my hand the bass stop it's Possible to fix that like the pad play .
thank you

This doesn't (and won't) work in Ketron because Ketron sounds are designed to try and emulate/copy the original instrument ("Best Natural Sounds" is our goal).

A bass Guitar doesn't 'naturally' have endless sustain.