This probably means you and your friend have different computers. Some computers have built-in hardware limitations that prevent users from pressing three or more keys at once. Unfortunately there's not a whole lot we can do about this, so if you want to play chords we suggest you get yourself a USB keyboard. It doesn't have to cost a lot of money, and it will probably be a lot cheaper than buying a new computer :)
Here are some examples of USB MIDI keyboards that work great with Soundtrap.
You can hold two notes on the keyboard and click the third with the mouse, simultaneously, to make a 3-note chord.
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