Muscle-specific component of the BAF complex, a multiprotein complex involved in transcriptional activation and repression of select genes by chromatin remodeling (alteration of DNA-nucleosome topology). Specifically binds acetylated lysines on histone 3 and 4. In the complex, it acts as a tissue-specific anchor between histone acetylations and methylations and chromatin remodeling. It thereby probably plays an essential role in heart and skeletal muscle development. Belongs to the neuron-specific chromatin remodeling complex (nBAF complex) and plays a role in neural development. Component of the BAF complex. Interacts with acetylated histones H3 and H4. Component of neuron-specific chromatin remodeling complex (nBAF complex), a subfamily of ATP-dependent SWI/SNF chromatin remodeling complexes (By similarity). Expressed in the heart and somites. The PHD-type zinc fingers mediate the binding to acetylated histones. Belongs to the requiem/DPF family.