Track refers to the audio track, which can be one for each instrument. The same instrument can be divided into audio tracks according to the part, or can be divided into more according to needs. The superposition of multiple audio tracks is equivalent to the effect of an ensemble. . Dry sound refers to a track that has not been processed by software. Generally, our musical instrument recording will require reverb, echo and other effects. Dry sound refers to a track that has not been processed in any way.