Cant get array buffer refrence to work... Help please?

One extra "spanner in the works" - if you fancy a little bit more experimentation...
see this thread - Flow to decode binary data and a walk-through on how to install the npm module
shows a way to use a library to help decode a blob of data. It also mentions the binary node that does the same as a simple node.
Either way may be useful to help unpack and pack the values you need in a more consistent manner.

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