I spoke with Oticon. They stated it is likely the Start-up "jingle" meaning it is the tones that come one when the hearing aid is first turned on. If you are having the tones happen after you've worn them a while, it indicates the power is going off and coming back on. You can change the battery. If it is a new battery you probably want to try a new one from another pack. When getting a new battery, remove the sticker then wait for 5 minutes for the battery to fully charge before putting it in the hearing aid. If you continue to get the tones intermittently, you should see your Audiologist/HIS. It is possible there is a problem with the hearing aid or a brand of batteries that cannot keep a steady charge.
Most Oticon products play a short tune as the circuit "boots up". This tune will be heard shortly after the battery door closes, unless it has been disabled by your hearing care provider. It just lets you know your instruments are working properly. You may only hear part of the tune depending on how quickly you insert the instruments in your ears.
The seven tone "tune" that you are referring to is likely the start-up jingle. The hearing aid will do this each time it starts up or reboots itself, and this is normal if this happens only when the battery is first engaged. This is indicative of a circuit malfunction if the hearing aid continues to play the jingle in the absence of you initiating a reboot.
The jingle is activated in the default (factory) settings from the manufacturer. Your audiologist can deactivate the jingle if you do not like this feature.
This Website Does Not Provide Medical Advice. All material on this Website is provided for informational purposes only. Inclusion of information on this site does not imply any medical advice, recommendation or warranty. Answers provided should not be considered a substitute for the advice of health professionals who are familiar with your specific medical history. Experts who provide advice via "Expert Answers" assume no liability for the accuracy or completeness of, nor any liability to update, the information provided.