O’Reilly has recently released the book “Making Musical Apps – Real-time audio synthesis on Android and iOS”. From the publisher’s website:
“Want to turn your mobile device into a musical instrument? Or equip your game with interactive audio, rather than canned samples? You can do it with Pure Data (Pd), an open source visual programming environment that lets you manipulate digital audio in real time. This concise book shows you how to use Pd—with help from the libpd library—as an easily embeddable and widely portable sound engine.”
I’ve embedded a preview, via Create Digital Music:
Making Musical Apps (Excerpt: How to Build a Music App for iOS)