Connect your computer to your recording device via a serial cable to a 3.5 mm cable. Plug the serial end of the cable into the serial port on your computer. Plug the 3.5 mm end of the cable into the "GPI Socket" on your recording device.
Connect your audio source to the "Audio In" ports on the back of your recording device, using a 3.5 mm-to-3.5 mm audio cable. Stereo analog recorders may have a left and right audio port. In that case, use a stereo RCA-to-3.5 mm cable to connect your audio source to the recorder.
Launch your recorder's software on your computer. Visit the setting menu inside of the application, and then assign your serial port to a "Com" port by selecting the "Serial" option from an unused "Com" menu box in the application. If your com port assignment requires a data speed, select the "9600" option.
Select the "Record Schedule" or "Event Schedule" option from the application's main menu. Specify recording as "GPI-triggered," and then select the time you'd like the trigger to start. Specify your recording length in the "Duration" or "Length" field.
Return to the "Record Schedule" or "Event Schedule" option, and then set up another GPI-triggered event. Set up as many events as you'd like, returning to the event scheduler to set up each one.