I used SERUM on occasion, continued to use other synths… then, after my years of use of THE Synths… Yamaha Motif 6 Original Sampling Keyboard Workstation, Native Instruments MASSIVE… Blofeld Largo… during- and after Spring 2019, I bought OP-X PRO II, THE soft synth for analog synths… enjoyed the Daven Hughes FL Studio Sytrus Presets, then his Cycle… then Native Instruments Absynth 5, MASSIVE X… multiple instances - 3-4+ each - of the these Synths allow better Stacks AND Sound Quality than KORG RADIAS and KORG M3 stacked (the two KORG Synths combined resulted in THE Synth Pads of 2-3 sounds at the same time, reference youtube demos of those KORG Pads)… Spire is good, but not quite fully Professional for Sound Quality… I needed more than some very good EDM Synth sounds… THE EDM Synth sounds… SERUM! The default SERUM Synth sound, THE digitized version of THE analog Synth sound for Professional EDM Pluck Synth… AND Polyphonic! …when you Stack multiple instances of SERUM, the individual sounds, not merely at the same time, are 100% Professional Production Quality! With SERUM, you get THE Professional Production Quality of Sound of all of THE Digital versions of Analog Synths… Multi.s….