YOU SAID:

Okay new theory maybe we should play so quietly no one can hear us

INTO JAPANESE

よし、新しい理論だ。誰にも聞こえないくらい静かに演奏したほうがいいかもしれない

BACK INTO ENGLISH

Ok, new theory. Maybe I should play it quietly so no one can hear me.

INTO JAPANESE

よし、新しい理論だ。誰にも聞こえないように静かに演奏したほうがいいかもしれない。

BACK INTO ENGLISH

Ok, new theory. Maybe I should play it quietly so no one can hear me.