Now there are apts and sound editors that make you sound like that you're on helium but in this case it does no harm no matter how much you use it.
There is a free sound editor software called "Audacity" no it is not filled with spyware, malware and/or viruses they just take donations.
I used to use Audacity (after I set it to input) to record my old records and tapes into the computer first before I burn them to cds and if I had choosen "stereo mix" or "mono mix" I can record audio directly from my soundcard.The input cable and mircophone needed to be unplugged tough since "stereo mix" or "mono mix" will record from those as well.
What I use Audacity now for is to edit public domain music so it will fit my videos via "edit" and "trim audio" before I do that , I go to "effect" and click on "reverse" so my audio track will play backwards then I highlight it to a point where I want it to end.
After the reverse audio is trimmed ,I highlight near the end ,click on "effect" and click on "fade out" and finally reverse the track again so I can play it forward. Why do I do this ? On some music I like the way the music ends and after the reversing ,the "fade out" becomes the "fade in"; In fact ,I have used the above method for the video below I titled "March Madness again???"
Below is a video of Ariana Grande and her friend on an"helium apt". They did use real helium once bad idea and I still don't know if they had mixed the helium with oxygen first before they have done that.
To sound like you're on helium ,first set Audacity to microphone and record the regular way, after that .go to "effect" and "change pitch". To save the file: Go to "file" and then to "export" or "export section"
Not only can you sound like you're on helium (pitch level positive 50%) ,but you can also sound like you're on hydrogen as well ,making a woman's voice sound like a man by lowering the pitch level to a negative 50%.Just experiment with it.
A woman's voice is 880 cps (cycles per second) and a man's voice 440 cps. Both male and female dogs prefer to hear female human voices ,as for sellspeople both men and woman prefer female, unless they're looking for something important then it doesn't matter.
Here's a helpful hint: If you're at Wal-mart or any other department store and can't find what you're looking for ,and none of the workers are around ,stay in the same asile for awhile they'll send someone right over "May I help you?"---lol
Screencap of the free Audacity sound editor below: