AudioRealism Bass Line Pro (ABL Pro) is an application excels at pads and leads and is something of a hidden gem for many producers. The filter is based in the 202 filter which sports self oscillating resonance, tuning, and range. The pattern randomizer lets you create patterns in different keys and scales using different densities of notes, accents, slides, and gates. The configuration screen allows you to customize your ABL Pro to your liking. It supports three low pass filter selections (303-emulated and the standard 24dB 202 simulation plus an oversampled variant for even less aliasing).