Low Latency Sound Effect support
Needed to create pro level sequencers, synths and music creation related apps!
WP has the potential of being the most sophisticated mobile OS (with the experience and expertise of Microsoft)! Without proper real time audio, there is a large range of possible and attractive applications unavailable to this OS, while other mobile OS have that capability.
Have you looked into Windows Media Foundation?
Antoine Cloutier commented
Ironically, WP7 had better latency figures than WP8. With WP8, the XNA audio APIs have apparently been shoved further up the audio stack: WP7 apps perform much worse on WP8 in this regard. (Of course, XNA being shelved/killed, this kind of performance degradation was to be expected.)
On Windows Phone 8, WASAPI is the bottommost API one can use to capture and render audio. On the Windows desktop, you can achieve very low latency figures (< 5ms) with this API (in exclusive mode). On Windows Phone however, the best latency figure you can get is around 70ms (from code execution to render) or 140ms (from capture to render). This is really bad for real-time audio. Below 20ms, the brain perceives delayed audio as some kind of reflection of the original impulse (akin to reverberation). Above 20ms, the delayed audio is perceived as a distinct echo, which is totally inappropriate when playing an instrument. The lack of low-latency audio in the platform is a major roadblock in the creation of a serious musical app.
Until Microsoft prioritizes this, iOS will keep enjoying all the nice audio and music creation apps (and Android too, they're catching up fast). And WP will only get the lamer ones. If we're lucky. WinRT/WinPRT people, take action please!
I'd be happy to further discuss this with Microsoft. I have apps that I'd like to bring to the platform.