για να σε βοηθησω χαζευοντας το manual της ESU 1808 βρηκα αυτο
Via Config > Latency in the Control Panel it is possible to change the latency setting (also called “buffer size”) for the ASIO driver of ESU1808. A smaller or “faster” latency is the result of a smaller buffer size. The available settings are highspeed, rapid, fast, normal, relaxed normal and relaxed. Depending on the typical application (e.g. for playback of software synthesizers) a smaller latency is an advantage. At the same time, the best latency setting indirectly depends on the performance of your system. For recording applications, the normal setting is recommended. Note that the latency has to be setup before launching the ASIO application using ESU1808.