I’m out of my mind.

Latency on my Alesis Q61 is sending me nuts. I cant do my music. Somebody help me.

I've had this Q61 keyboard for over a year and had no trouble.
It now suffers from latency problems in that the sound comes after hitting the note. So I cannot make my music.
I have been in touch with the shop where I bought it and they cannot help me.
I am using it with Logic ProX 10.2.0 in my iMac 10.10.5 OSX Yosemite.

How can I put this right?
I have reduced the buffer size and hit the right keys to reset the kepboard to factory settings.
What can I do now to make it work properly?
I hope you can help.
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