The A-128 is Doepfer’s Fixed Filter Bank module. The module is essentially a fixed filter bank with dedicated volume controls over each filter. It features fifteen different bands, each with their own volume control, that are effectively spaced across the frequency spectrum to ensure extremely musical results.
Fixed Filter Bank
15 different frequency bands
50Hz, 75Hz, 110Hz, 150Hz, 220Hz, 350Hz, 500Hz, 750Hz, 1100Hz, 1600Hz, 2200Hz, 3600Hz, 5200Hz, 7500Hz, and 11000 Hz.