For a general introduction to audio ads in Sweden, please see IAB's Digital Audio Handbook
Audio inventory can be purchased in three ways:
Proper Audio creatives
ASX supports the DAAST standard for audio creatives, and will analyze bid requests for the Audio objects present from OpenRTB 2.4. To set up your campaign to respond to this inventory, follow these steps:
Set up audio creative
Set up an ad of type "Audio Ad"
Assign the audio creative to the audio ad
Target supply with Supply Type: audio
Audio posing as Video (Magnite / Rubicon Project)
Many sellers are providing means to buy audio ad inventory through the same setup as for video. To target this inventory in BidTheatre DSP, follow these steps:
Set up video creative with a mime type indicating audio
Set up an ad of type "Video Ad"
Assign the video creative to the video ad
Target supply with Supply Type: Video (but actually is audio supply, accepting video creatives with an audio mime type
Note that this goes for Spotify inventory, which specifically needs .ogg or .mp3 media files, and can only be bought via PMP.
The in-between (Xandr, AdsWizz)
Xandr audio inventory is present as Supply Type: Audio, but creatives will need to be presented as the VAST standard used for video. To bid on this inventory, follow these steps:
Set up a video creative with a mime type indicating audio
Setup an ad of type "Audio Ad"
Assign the video creative to the audio ad
Target supply with Supply Type: audio