Android audio development poses some unique challenges. Before you start making a musical app for Android, you have to consider the limitations of the platform. The biggest problem is latency; at the time of writing, round-trip latency for audio I/O is in the hundreds of milliseconds on all devices that I know of (fortunately, straight output latency is significantly lower). Another concern is fragmentation. The Android ecosystem has many niches, populated by a bewildering array of devices covering a wide range of OS versions, screen sizes, and input methods, frequently complicated by manufacturer-specific tweaks to the software. Audio capabilities and computing power vary widely as well, and it is not easy to discover ....