Re: Note repeat just a lilttle off...
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Yes, it could be down to latency (the time between you trigger a note or play a sound into Logic and the time it takes to be processed by Logic and for you to monitor it back (hear it).
In Logic Pro > Preferences > Audio
you can adjust the I/O Buffer size. A smaller amount will produce less latency but place more strain on your Macs CPU.
Find a setting that works for you... Somewhere between 64-128 should be fine.
Otherwise this may simply be that you're triggering notes slightly off the measure. In which case, click on the Arrange background to select nothing.
In the Inspector you'll see an area called MIDI-Thru. Set the Quantize value to 1/16. Now when you record the notes will be non-destructively quantized to every 1/16.
Hope that helps :)