Room acoustic simulation algorithms have evolved to powerful tools in recent years. Additionally to traditional tasks, such as prediction of room acoustic parameters (e.g. reverberation time, strength etc.), they are commonly used for auralizations nowadays. For a lively and natural virtual representation of real sound sources, it is important to include their individual characteristics in terms of directivity patterns and spatial dynamics. For a high quality auralization of a full orchestra, the radiation patterns of symphonic instruments were captured using a surrounding spherical array and stored in the free openDaff directional file format. Using a hybrid image sources and ray tracing method, room impulse responses (IRs) were calculated for each orchestra instrument. The player’s movements were simulated by applying an artificial ‘humanization’ to the position and orientation vectors. The simulation generates binaural signals as well as spatial impulse responses in spherical harmonics (SH) format, which can then be convolved with anechoic recordings of each part. Using the flexible SH representation and head-tracking, a dynamical and immersive auralization can be achieved that reacts on the listeners head movements.