Mic Latency

[OldMacTech]

Logic Pro X
Mini, core 15
8 GB RAM
Mavericks
Ultralite Hybrid MK3

Had it a few weeks, after figuring out some of the buttons, happy.

Making a track in Logic, simple stuff, Virtual drummer, bass, GTR, Grand Piano virtual. Armed to do a scratch vocal and wow...big time delay (latency) 1/4 sec or so. Played around with it, took all the effects off, still laggy. Thing is, I've already made 3-4 vocal tracks on other songs with no real lag at all and I haven't changed the settings from one to the next. (at least I don't think ) and I've made several other vocal tracks after and it seems to be only on this one song....

Hmm. Any settings I should check?

Thanks.

JB