Korg MS-20chat_bubble_outlineFrom real comments

The dual resonant filters define the MS-20's unique, aggressive character. Commenters repeatedly single out the high-pass and low-pass filters as the standout feature, calling them 'insane,' full of character, and central to the synth's raw, unpredictable, musically chaotic sound. Owners note the filters can produce everything from wicked bass and orchestral string tones to distorted noise effects, and many say this filter section alone justifies owning the instrument over decades.

The patchbay and ESP input unlock deep, versatile sound design. Owners highlight the semi-modular patchbay for routing envelopes, LFOs, sample & hold, and ring modulation, plus the external signal processor that lets guitar, mic, or other synths run through the MS-20's filters. Several users describe extensive setups pairing it with Eurorack gear or other synths, calling the patchbay a 'hidden treasure' offering nearly endless cross-modulation possibilities.

Noise, quirky envelopes, and lack of memory are recurring frustrations. Multiple users report audible hiss or white noise from the filters, especially when soloed, with some suspecting demo background music exists partly to mask it. Others cite the reversed EG2 envelope logic as confusing compared to standard ADSR designs, vintage oscillator tuning drift across the keyboard, and no preset memory, requiring manual photos of knob settings to recall patches.