Just in case someone doesn't know what a tromba marina is (ok, nearly everybody should ignore that, as the instrument was abandoned before the baroque era):
the bowed string instrument has a special bridge called guidon, just in equilibrium so one foot hits the soundboard at each vibration cycle to produce a loud strident sound resembling a trumpet.
Tromba_marina and Schnarrsteg on Wiki
Being a historic curiosity, it's mostly played by people who invested little time to learn it without a professor, but here's one good audio record. Yes, that's a string instrument.
wlBolbo24Rc on Youtube. Enjoy this rare sound!

The horn violin, or Strohviolin, or in other languages vioară cu goarnă and Stroh hegedű, isn't so common depending on where you live. I heard only one in real life.

The instrument replaces the soundbox by a metal membrane and a horn or two. The sound tends to be very tinny and narrow, but some instruments are less bad in this aspect, possibly the ones built by Stroh with a wider horn. Examples:
sU2MZseFzYs?t=169 (should jump to 2:50) - Y82pYGUSMI8
and here also a cello and a bass
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I wouldn't give up a true violin for that, but it's fun.

An other good record of tromba marina
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A builder/luthier called "Unprofitable Instruments" builds Tromba Marinas, as well as other, well, "unprofitable" pre-baroque instruments. They even own the domain "trombamarina."

Link: http://www.trombamarina.com/instruments/tromba-marina (it looks like I may not have the ability to post links yet).

The bottom of the page above includes audio files of the site owner playing a tromba marina with a high school orchestra.

You can get one made for $5000.

I always wanted to learn rebec, but time continues to be a scarce commodity.

Edited July 18, 20205 yr by ewomack