When using the sox node, an unhandled promise rejection takes place.
(node:11860) UnhandledPromiseRejectionWarning: ReferenceError: data is not defined
at input (/home/andreab/.node-red/node_modules/node-red-contrib-viseo-sox/node-sox-command.js:45:53)
By looking at the code it appears as if the "data" variable should be "msg" instead , but it's my guess.