Hi all, I would like to measure the delay of an audio signal in an entertainment system. I'm sending a 1 kHz sine wave, whose amplitude changes every 3 sec from 0.99 to 0.10, to the speaker. In two places I pick up the signal and send it to the Oscilloscope (Tektronix TDS5104B). Now I want to set a trigger so that the signal stops exactly when changing from low to loud sound and I can see the delay to the second signal. Which trigger should be used for that? It has worked neither with the edge, nor transition nor runt trigger. And what's the deal with the trigger holdoff? Unfortunately, the user manual of the oszilloscope couldn't help me. Thank you for your help!