How it may have sounded. And someday hopefully will!
A friendly reminder that a true duet is a synergy of two voices and mutual support of artists to one another - not a competition or a comparison. This virtual duet made with a same thought, and with best regards to both of them, not for a sake of finding out who's better! Please refrain from comparing them in comments - both performances are great, just as they are great in combination.
And yes, Yerzhan is only at the beginning of his path, but please don't say anything offensive to him.

Made in Cubase by request from comments. Note: there's couple spots in the video where Yerzhan's voice doesn't match his lips - that's not lipsync, but my fail at video editing. The source video was desynced as well, and I had to move parts of audio here and there to match them in a duet, but I never bothered to fix video expecting this to get like 10 views anyway. -_-

   • All by myself - Димаш Кудайберген и Е...   - previous "duet" All by myself:
   • Video   - virtual collab of Dimash and his clone :) Ascolta La Voce

Videos used:
   • Dimash - Adai+Daididau | Bastau 2017   - Daididau by Dimash in Bastau
   • «Голос. Дети-2019» тележобасының жүлд...   - Daidudau by Yerzhan on Qazaqstan TV

All rights for performances belong to Dimash and his team. I only mixed them together.
Cannot be monetized by anyone other than legal copyright holders.