FabFilter Pro-MBA new approach Instead of conventionally splitting the entire spectrum with crossovers, Pro MB enables you to directly create a new band at the frequency range you want to work on. Think bands, not crossovers. The interactive multiband display clearly shows that the rest of the spectrum stays untouched. And if desired, you can easily snap bands together to recreate a traditional crossover system. Lifesaver and timesaver FabFilter Pro MB introduces a