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I updated my SD-40 to 1.2.0 and then to 1.2.1., and don’t have any issues with latency. Perhaps you just need to re-configure the startup, which may have been overwritten by the update. Or perhaps, copying the old startup files (.startup, .accordion_setting and .organ_setting) to the root directory might work. I also have an SD-90 that I recently updated, and was able to keep my configuration post update as it was pre-update. Note that I can’t vouch for this with certainty, but both updates seem to work fine for both of my units. Also note that A.J. provided me the information about copying the old startup files, so it is most probably good information.

Thanks Dwayne for your info. I did not have any issues with the last two upgraded versions. I will try to reset the setting as per your suggestion and hope it would work.


Hi Curt,
Thanks for your videos. I have learnt so much from you. Hope you continue posting your how to videos so people can learn. I have some questions that need your help. I recently updated the new version 1.2.1 for my Ketron SD40 and I didn’t like it because there is a latency. I want to reload the previous version. Could you show me how Please.

Thanks Curt,


Thanks Curt for your quick response.
What can I do with out your helps?
Thanks again.


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