"The SD1 had so many bugs, then it was updates after updates. The xd9 & Sd5 also has bugs"

The XD9 came out after the SD1. However,the XD9 had one feature that the SD1 didn't and that feature was the "remix" feature. The Remix feature allowed the drum tracks from a style to be used in real time vs. the drum track that came with a standard midi file.

So here is the XD9 with a feature that the flagship keyboard (SD1) did not have. They thought they needed to add "remix" to the SD1 and came out with OS 4.0 .

This move was the start of many problems for Ketron.Owners had problems changing to OS 4.0 and many customer service issue's arrived ! and they would call their store or say
" Help Help I just try to upgrade to 4.0 and it didn't work " . MAJOR HEADACHE ...