http://www.studioelectronics.com/products/synths/se-1x/specs-architecture/#crumbs
VOICE ARCHITECTURE
VCOs:
Three voltage controlled discrete analog oscillators, triangle, sawtooth and variable width square waveforms. All waveforms output simultaneously. Osc 1 syncs to Osc 2 and 3.
VCFs:
Two voltage controlled discrete analog filters: 24db (classic Moog®), 12db (classic Oberheim®). 12db filter incorporates low pass and band pass modes.
VOICE ARCHITECTURE
VCOs:
Three voltage controlled discrete analog oscillators, triangle, sawtooth and variable width square waveforms. All waveforms output simultaneously. Osc 1 syncs to Osc 2 and 3.
VCFs:
Two voltage controlled discrete analog filters: 24db (classic Moog®), 12db (classic Oberheim®). 12db filter incorporates low pass and band pass modes.