They can play several noes at the same time, through double stops or triple stops, where the player plays two or three strings at the same time. However, to pull of this off in a manner that’s possible to play, it requires some knowledge of the instruments to notate it properly.
Their tone color is darker and warmer in the low range, but thiner, brighter and more brilliant in the high range. The range you place your string melodies in, will have a huge impact on how the tone color of your theme will turn out. If it is played in the lower register of an instrument, it will sound warmer and more gloomy. If you place it in a higher register, it will sound lighter and more brilliant. The higher you go, the more thin, brittle and penetrating the string sound will become.
They are able to play a lot of different articulations, like legato, pizzicato, con sordino, staccato, marcato, etc. Be familiar with the different articulations of the string family, and learn how to use them effectively.
Being the backbone of the orchestra, strings blend perfectly with all other instruments.Doubling melody lines and chords with strings is a potent way to strengthen other instruments through orchestration. For example, doubling a clarinet section melody with violas in unison, will make that melody shine even more.