Hi Amxf5,
yes, you can connect the Output jacks (Stereo) of your external Sound Module to the AUX IN jacks of the Genos.
The input signal from the AUX IN jacks is affected by the setting of the instrument’s [MASTER VOLUME] dial, and the volume balance with other parts such as entire keyboard can be adjusted by the Mixer display (see pages 86 and 109 in Genos Owner's Manual).
Best regards,
Chris