Just found the solution. May be late, but may be useful for someone else!!!
You can set different notification saound alerts for email, for calendar note and for SMS text messages.
SMS is simple: settings/sound/notification ringtone
Email: click on gmail (or other mailsupplyer) icon like when you want to check on your mails./click menu key (left of the only button under the screen)/more/settings/click on your account you want to change the sound of/scroll down to email notifications and swith it on (if turned off) / labels to notify/inbox/ringtone. Done!!!
Calendar: same things to do until you get into settings/here you can select ringtones too!
It took days to me to find this out, hope it helps you too!! :hello: