Record you keyboard with just a USB sound card only using your phone. There is no need to sync in post, audio will be recorded with video. Buy the product shown here:
1. USB sound card:https://www.amazon.in/dp/B007Z9K45U/r...
2. Audio splitter:- https://www.amazon.in/dp/B0719LFLKG/r...

3. 6.35mm Converter:-https://www.amazon.in/dp/B06XB6C295/r...
Open camera:-https://play.google.com/store/apps/de...

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If u r interested in science project and experiment DIY,please check out my another channel (mvjadav creations):-
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Follow me across social media platform for behind the scenes:

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