Stereo audio input, what's the point?

can someone explain to me what the point of stereo audio inputs are on this device? I understand you need audio input for the vocoder but is there any other purpose here? I purchased this assuming the inputs were for stacking a second synth on top but apparently astrolab does not have this ability?

Other than the Vocoder, some other instruments in V-Collection/Analog Lab/AstroLab have an audio input that can be used in the synth:

  • ARP 2600 V3
  • Buchla Easel V
  • KORG MS-20 V
  • Mini V3
  • Pigments
    In particular, Pigments has stereo audio input (in the Utility Engine) that goes to the filters and FX.
    Arturia has provided a template preset that uses this feature here: Audio In Pigments
    Using such a preset as one Part of a Multi in AstroLab provides a processed audio in, mixed with the other AstroLab part.