Component of the velB-vosA heterodimeric complex that plays a dual role in activating genes associated with spore maturation and repressing certain development-associated genes (PubMed:26243054). The complex binds DNA through the DNA-binding domain of vosA that recognizes an 11-nucleotide consensus sequence 5'-CTGGCCGCGGC-3' consisting of two motifs in the promoters of key developmental regulatory genes (By similarity). Positively regulates the expression of wetA and represses abaA and brlA (PubMed:26243054). Acts as a crucial regulator of both conidiation capacity and conidial quality (PubMed:26243054). Responsible for the synthesis and accumulation of intracellular trehalose (PubMed:26243054). Forms a heterodimeric complex with velB; the formation of the velB-vosA complex is light-dependent (By similarity). Expression is positively regulated by wetA and brlA (PubMed:26243054). The N-terminal velvet domain contains a NF-kappa-B-like fold and is involved in DNA-binding (By similarity). Decreases expression of wetA and affects expression of abaA and brlA (PubMed:26243054). Leads to loss of conidiation capacities and defects in conidial tolerance to high osmolarity or UV-B irradiation but no change in conidial sensitivity to H(2)O(2) or the fungicide carbendazim (PubMed:26243054). Belongs to the velvet family. VosA subfamily.