I made this alarm sound for myself, I wanted something that was smooth and not annoying but yet noticeable, which could be used in every environment without troubling everyone around me. So this is what works for me.
I made it with www.texttomp3.online using its engine 3 English female voice, saying "Ring a ding ding, this is a scheduled alert, check your tasks!" 7 times while playing the beautiful song "A New Beginning" from Bensound at www.bensound.com (https://www.bensound.com/royalty-free-music/track/a-new-beginning) on the background. It lasts for 46 seconds.