Regularly the orchestra enlarge the cast with selected strings, winds, percussion in additional. It allows participation in big projects, like: opera performances, symphony concerts etc.  
Actually, the orchestra exist by two forms:

SOFIA SOLOISTS CHAMBER ORCHESTRA (SSCO):15 members
SOFIA SOLOISTS (S.S.): SSCO+ strings, winds, percussions in add., depending on the needs of the productions, scores and managers.

 

CAST of THE ORCHESTRA

First Violin
Yordan Dimitrov - Concertmaster
Emil Boshev
Jechko Petkov
Evgeni Noev

Second Violin
Dimitar Danchev - Leader
Nikolai Yanakiev
Nikola Varbanov
Petar Ganev

Viola
Ognian Konstantinov - Leader
Viktor Mitcev
Todor Mitrov

Cello
Dimitar Tenchev - Leader
Todor Georgiev

Double bass
Tcvetomir Lazarov