Andrew Audacity is a free program in which you can generate tones of given frequencies. I have generated a file which is a continuous tone of 440Hz - concert A. There is an app for the i-phone called "tuning fork". Hth David -- I am using the free version of SPAMfighter. We are a community of 7 million users fighting spam. SPAMfighter has removed 1455 of my spam emails to date. Get the free SPAMfighter here: http://www.spamfighter.com/len The Professional version does not have this message ** To leave the list, click on the immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=unsubscribe] ** If this link doesn't work then send a message to: ** access-uk-request@xxxxxxxxxxxxx ** and in the Subject line type ** unsubscribe ** For other list commands such as vacation mode, click on the ** immediately-following link:- ** [mailto:access-uk-request@xxxxxxxxxxxxx?subject=faq] ** or send a message, to ** access-uk-request@xxxxxxxxxxxxx with the Subject:- faq