Sustained cello not really working ( on safari )

[GamemakerX1]

I manage to make them [The sus strings] work somehow. [by doing cords.] However, we tried to make them play high notes. [The range was the whole keyboard, which I liked.] When the range of this instrument was reduced [down to the same range of the cello], I was mad because, I knew it was going to the OG cello. [with sus instead of sus Strings.] Thanks to the universe update, transposing them was possible. It was ok but, then I learned [The hard way] that it was going to sound low quality. [Very Squeaky]