You probably want to be able to record the external FX outputs into Logic (to free up the FX for other uses) and have it play back exactly as it was monitored, right?
Using your 4/4 audio click track, panned left, send to an external delay (approx 1/2 beat, single repeat). Pan the delay return R at source and monitor as above. Rerecord the main outs to new track via a hardware loopback cable. Measure the number of samples from a click to its delay in the Sample Editor Now record the delay return signal to a new track. Playback just the audio click panned left & the recorded delay panned right. Rerecord the main outs to new track via hardware loopback cable. Measure the number of samples from click to delay in Sample Edit. Both measurements must be the same for accurate recording of FX returns, but it’s likely they won’t be, probably because the playback delay has been messed with. Compensate by inserting a sample delay on the FX return Input Objects in Logic. Since you’re not monitoring the FX returns through Logic anyway, the input delay will be recorded but not monitored (in 5.2+, but if you use an earlier version you’re hosed since effects are no
