well i never really used my mogul as an alarm nut i did use my touch as an alarm and it was pretty damned loud but it never did as good a job of waking me up like my touch pro does. i use a third party app as an alarm. its called G alarm and works great you can tie it to touchflo 3d so that it shows up as a regular alarm but works far better than the windows mobile alarm i love it. check it out here.
http://www.ageye.de/index.php?s=download