tshoppa@gmail.com said: > Or should I, say, take the PPS from a GPS, and feed it into channel 2, with > the audio going into channel 1, and make a stereo recording? ... I assume the audio API is for a batch of samples. If you get time stamps on a stream of batches, you can work out the frequency of the crystal the audio A/D is using. I think you will need the PPS approach to calibrate the delay through the system. If it's low enough, you can drop it. -- These are my opinions. I hate spam.