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You need to replace the 00 by xx z4. Z4 is the checksum Atom created for all the Roland gear, so i suspect this would help you there.
Also make sure all your Sysex command is either all in caps or all in lowercase. While working on a panel for the MKS-70, I had issues when mixing upper and lower cases, so i decided to use lowercases only and it’s now working. Unfortunately the synth doesn’t update the Tone parameter values i’m sending it. It’s as if they need a validation of some sort.