Non-reducing polyketide synthase that synthesizes 6-ethyl-2,4-dihydroxy-3,5-dimethylbenzaldehyde via condensation of one propanoyl-CoA starter unit with 3 malonyl-CoA units, as well as 2 methylation steps. AH2 + H(+) + 3 malonyl-CoA + propanoyl-CoA + 2 S-adenosyl-L-methionine = 2-ethyl-4,6-dihydroxy-3,5-dimethylbenzaldehyde + A + 3 CO2 + 4 CoA + H2O + 2 S-adenosyl-L-homocysteine Binds 1 phosphopantetheine covalently. Secondary metabolite biosynthesis. Multidomain protein; including an N-terminal starter unit:ACP transacylase (SAT) domain, a beta-ketoacyl synthase (KS) domain, a malonyl-CoA:ACP transacylase (MAT) domain, a product template (PT) domain that controls the immediate cyclization regioselectivity of the reactive polyketide backbone, an acyl carrier protein (ACP) domain, a methyltransferase (CMeT) domain responsible for the incorporation of methyl groups, and a reductive NADPH-binding domain that is required for NADPH-dependent product release.