Recorded Tracks not synchronised

[Zlartibartfast]

I found that using a second computer for DAW function yields better results, or use an external sound module rather than software synths.

What I've seen is that even with a very fast computer, higher jitter occurs whenever additional tasks are run. I started using an external FX module for reverb on vocals, and my old Macbook for Logic, which is driving an external synth module along with MTron (software Mellotron). With this setup, I have jitter < .7ms, averaging .3ms

I have a friend who uses multiple iPads for loops and effects, and an external mixer. He told me this setup keeps his jitter down around the .5ms range.