DRC

1 OSC Square Wave dropped one octave
2 OSC same volume, same octave, square wave, fine detuning (right),

1 EG slowish attack, normal ds, raise release a little bit
2 EG increase modulation a little bit
2 EG raise attack to half, bring decay to maximum, sustain to half, raise release a little bit

chorus: low rate, norma depth, no feedback
lpf: 800, subtle resonance

reverb: loads of decay and a nice amount