Methods, systems and other embodiments associated with pre-processing a signal for spectral analysis are presented. Prior investigations into the biosynthesis of sorgoleone suggested the participation of one or more alkylresorcinol synthases, which are type III polyketide synthases that produce 5-alkylresorcinols using medium to long-chain fatty acyl-CoA starter units via iterative condensations with malonyl-CoA. When operating the DVC by using a GUI element displayed on the operation panel, a user operates direction keys and selection keys on the first operation unit. In the process disclosed, the tower reboiling scheme is modified to use one or more tower liquid distillation streams from a point higher in the column than is used in the conventional reboiling scheme, providing colder stream for the reboiler that allow more effective cooling of the feed streams and thereby improve the efficiency with which the desired components are recovered.