Q: Latency in logic x with Yosemete

What hardware are you using to go in to your MBP?

Have you adjusted the I/O Buffer Size in the audio preferences?

Larger buffer, more CPU needed, more latency.  Smaller buffer size, less CPU power needed, less latency.

thanks buffer size not the problem, found the problem but not how to sort it, VOX ARTURIA PLUG IN is the problem.

it affects the way audio arrives in logic x one initiated

Ah, that is very interesting.  I'd contact Arturia and check in with them.  I have their Minimoog V Original plugin, but that's all of their's that I own.