How to minimize MIDI delay while playing

hi guys
I have iMac 2.66 Core 2 and synth modules connected thru MOTU 828mkII USB A/D converter. When I play audio and plugins from Logic everything is synced. But when I play synth module via MIDI keyboard thru eMagic MT4 midi in/out there is audible sound delay of cca 100ms . Is it possible that MIDI signal travels so slow thru iMac to MOTU 828 (audio monitoring comes from MOTU)? I tried this MIDI controller in different environment and everything was fast. Even 10 years ago this wasn't a problem
thanks

The motu has a 'cue mixer' program.. Open that up and set the balance between, the instrument you are playing live, and the output of Logic.. Make sure your keyboard is in 'local control' mode. So that you hear what your are playing, and not the output of Logic being fed to your current midi instrument..
Make sure the output of Logic does not have an 'adlimiter' on it.. (it delays everything)
You could also go to core audio preferences and shorten the buffer as much as you can without Logic beginning to 'stutter'
Because The motu 828 (and most of the more expensive boxes) have a 'live input, no latency mode' setting. You should not have the kind of delay you are talking about..
One possiblity might be, that you have "local control off", so you are having your Midi travel from you keyboard, into Logic, and then sent back out. Temporarily shut off any plugins you have on which may be adding to latency. Shorten audio buffers too.

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