Hi. I own a 7th gen ipod nano, and I love to run outside..I would like this device to help me be a faster runner. I think I could achieve this goal if my nano made it possible for a voice to tell me my progress every 7 minutes and 30 seconds and then after a few days I would like it to be every 7 minutes and so on. .. Is that possible? it seems that they only tell me my progress every 5 minutes and there isn't any other option. . Please help me. Thank you.