Baritone

The baritone is tuned as a cello. The body resonance is nearly three semitones lower than projected, and this departure probably accounts for the somewhat bass-like quality on the low C 65.4 Hz string.
The baritone’s strings are 0.75 inch (1.8 cm) longer than those of the traditional cello.

A concert cellist once said after playing it for half an hour: “You have solved all the problems of the cello at once. But I would like a conventional cello string length.”
Thus a redesign of this instrument is desirable by shortening the body length a little. This redesign would raise the frequency of the body resonance and at the same time make a shorter string possible.