String Course

Strings per key

A string course is made up of either 1, 2 or 3 strings (tuned in unison), and this is what becomes activated when pressing one key.
The very low range are monochords (1 string per course), then comes 2 strings, and every key from the lower middle to the highest range have 3 corresponding strings per course.

Reference
Encyclopædia Britannica. "Stringed Instrument - Types of Instruments." Accessed January 26, 2025. https://www.britannica.com/art/stringed-instrument/Types-of-instruments.