I have been experimenting with Haiku Deck. Below is my first attempt. I created it using my iPad. I was also able to add notes to each slide but I don't see them in this embedded version. I do see the notes when viewing the web version
I don't see how to easily add audio. You can export to PowerPoint and then use Screencast-O-Matic to add audio.
I like how easily you can add images from Creative Commons. You can also add your own images but I found that to be more challenging.
The feedback was gathered using a free assessment survey tool, TooFast,
Created with Haiku Deck, the free presentation app for iPad