Merge branch 'master' of https://tree.clementinecomputing.com/clementinecomputing/popufare

experiment/sound/README.md

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 Sound Experiments
 ===
 
+###### 2020-02-10
+
 The Driver Interface Units (DIUs) and Passenger Interface Units (PIUs)
 on the buses need to be audible to drivers and passengers when accepting
 or rejecting passes.