It seems you were the most knowledgeable about Android in the thread. I don't particularly like Android as an OS, but recently I discovered that there are APIs

It seems you were the most knowledgeable about Android in the thread. I don't particularly like Android as an OS, but recently I discovered that there are APIs specifically for low latency that are on par with what I could accomplish with Linux without custom kernels. And I saw it work in one of my devices (literally hitting the screen hard not being able to tell apart the hit from the output sound). Apparently it's 9 ms of latency for my device. However, there are several problems: * There is few audio apps that make use of this API, and virtually none making proper use of it. All other audio apps are as laggy as always. * You can't expect to run well on any random device. * Regular development is awkward and constrained. One must be able to strip or personalize android to skip most of its development hell. * Since it needs customization and custom apps, you may as well use GNU/Linux instead, with more battle tested solutions. It is perfectly possible. Whether it's a good idea is another thing altogether.