Hi, I don't know in which programming language you are writing your application in, but you should be able to solve this problem with the multithreading primitives library of your choice. Sending data from one thread to another is far from being a rare problem. Have a look at [channels](https://en.wikipedia.org/wiki/Channel_(programming)). Most implementations offer the choice between blocking and non-blocking access. IIRC, even the JACK library itself provides some of these primitives (look out for some "ring buffer", "FIFO" and "queue", but it's been almost a year since I've dug into the source code). I've done something similar a while ago, may it help you: https://github.com/piegamesde/jackmidiosc/blob/69ad256/src/main.rs On Mon, 2020-07-13 at 21:17 +0300, u wrote: