Korg MS2000 Exploration korg ms2000r rack mount analog modeling synthesizer tested working uk boxed. KORG MS2000R Rack Mount Analog Modeling Synthesizer Tested Working. Three primary types of filtering are available -12 or -24 dB/oct LPF (Low Pass Filter), -12 dB/oct BPF (Band Pass Filter), or -12 dB/oct HPF (High Pass Filter).