Oh ok I see, Sorry, we were having trouble understanding your workflow. So, yes you can build audio only music app for playback on HLS devices, but to be honest to have multiple audio tracks like karaoke will not work very well and another SDK may be a better option for you.
I am assuming that you HLS enabled in the SDK settings? Have you tried to reduce the audio bitrate and test with just one audio track? Does it play the audio at all on an apple device? What happens when you play it on an Android device with HLS enabled?
What does your error log show you?
We need more info to identify the issue, but if you have HLS enabled and the audio bitrate isn’t too high, we have no problems on our end playing audio only on apple devices with the iOS SDK.
I’ll watch for your reply.