Recent inventions

More recently, the Stroh violin used mechanical amplification similar to that of an unelectrified gramophone to boost sound volume. Some Stroh violins have a small "monitor" horn pointed at the player's ear, for audibility on a loud stage, where the main horn points at the audience.

In the late 19th and early 20th centuries before electronic sound amplification became common, Stroh violins were used particularly in the recording studio. These violins with directional horns better suited the demands of the early recording industry's technology than the traditional violin.

Stroh was not the only person who made instruments of this class. Over twenty different inventions appear in the Patent books up to 1949. Often mistaken for Stroh and interchangeably known as being Stroh-viols, phono-fiddles, horn-violins or trumpet-violins, these other instruments have slipped into virtual obscurity.

The electric violin on the right was built by John Jordan in the early 21st century, and is tuned C G D A E. The history of the electric violin spans the entire 20th century. The success of electrical amplification, recording and playback devices brought about a comparatively swift end to the use of the Stroh violin in broadcast and recording.