I have made a soundfont, which has a smooth sound transition between the octaves. The C major of every octave is sampled from Synthesia Windows's built-in sounds.
I hope you all like it! This soundfont is useful in pieces which are soft, include arpeggios, or/and legato notes.
Since this soundfont is 65.92 MB which I cannot attach it here, I have made a download link.