> You're still missing the point that the latency only matters if the computer is both taking input (e.g. midi keyboard) and also creating the output (e.g. synthesized audio).
The computer could be taking multiple inputs, both midi and audio, and having to send audio output to an effects unit when then comes *back* as input again, and sending midi output to other sound modules which might be sending their audio output directly to a speaker, not back into the computer where it could be buffered to re-sync.
It's really not as simple as just lining up a few different audio sources.