USB-C to 3.5mm Audio Adapters (with/without Charge-Through option)
But I have had no joy with the following:
Type C USB-C to 3.5mm Audio Jack Adapter, ADTRIP 15cm
Belker Type C to 3.5mm Audio Headphone Stereo Adapter ConnectorDISDIM 2 in 1 Type C to 3.5mm Audio Headphone Jack Adapter with Charger
Motorola Moto Z Connector Type C to 3.5mm Headphone Stereo Adapter Connector
None of these audio adapters seem to be recognised by the phone, either natively or by trying to force a connection using SoundAbout Pro .
It is currently unclear whether Sony have implemented the USB Type C Audio Adapter Accessory Mode (Analogue Audio output)