 The DSS-1 has the same VCF as on the Korg DW series and the Poly-800 (Korg custom filter # NJM-2069).The DSS-1, unlike the DW series or the Poly-800 allows the filter to be switched between 12dB and 24dB modes.Modulation sources include two individual triangle wave LFOs (which Korg calls "MG" for "modulation generator").