d6ed6a32_ola_Online___Additional_Skills__DEFINITION
[NAME] Sul C Sul G Sul D Sul A [DEFINITION] 
Sul C means play on the C string and only the C string until otherwise indicated. In viola music, it is sometimes notated Sul IV or simply the numeral IV over or under the music, since C is the fourth string on the viola. Sul G (or III, the third string on the viola), Sul D (or II, the second string on the viola), and sul A (or I, the first string on the viola) also mean to play the notes on the single string indicated.
Viola Online - Additional Skills
DEFINITION