via this auction"This is NOT the MK2 version. Here are some differences between the one I'm selling and the MK2:
# S1 has 5 waveforms for the oscillators/lfo. S1MK2 has 7.
# The S1 LPF only function in lowpass mode. S1MK2 LPF functions in 2 different lowpass modes and bandpass mode.
# There are probably some other minor differences, but I don't know what they are."
