The product workflow WatchfolderMediaIngest has also been adapted to allow for the ingest of audio items.
You can use this as blueprint for your ingest workflows. Naturally, you should consider adjusting the "TargetShapeTag" input parameter of the Transcode Proxy Item task in the audio path for your needs.
Additionally, you have to remember to add the used ShapeTag in the Proxy Formats in section
GLOBAL CONFIGURATION -> HOUSE FORMATS
of the ConfigPortal. This is necessary for syncing the corresponding proxy files to MediaPortal.