Filch – for something like a dump request (or any momentary button) use 7f. With waldorf synths, any simple request has a checksum of 7f.
If you are sending values with a sysex slider/knob the checksum is xx as it’s variable.
In some cases depending on the type of message you must add two values together to 7F to get the checksum… be careful to not mix hex and binary values!!!!! The manual is pretty clear here, it’s usally BB and NN values you are adding together, but depending on what type of sysex message the manual will explain. You probably already got this, but remember xxh you can drop the h… that just is labeling the value as hexidecimal, not binary.
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