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Thanks, I think that should work.

Thanks. But our speech signal is not recorded through a microphone but is "pre-recorded" and presented through a computer's audio output. Can I connect the computer's audio output through the ERGO input?

Thank you. But I don't think either of these options can work. Those are options for using triggers. What I want is to record a long speech signal together with the brain in order to have them perfectly synchronized. Do you have any other suggestions?
Thanks

I would like to present the subject a long sequence of stimuli (20 mins) and have it perfectly synchronized with the EEG activity. What is the best to do this? In other systems I have used an EEG channel to "record" the stimuli simultaneously with the brain data. It would be ideal if I can do someth...