Hi to all! I have a Previa PX 5s and I would like to use at the same time sounds coming form Previa and sound coming from an expander yamaha Motif rack es. I did it connecting the output MIDI port of Previa with the input MIDI port of the expander, and connecting the audio out of the expander with the input audio of Previa. It works, but for some stage settings it does not! In these cases, I notice that the midi signals arrive on the exp, but the exp sound is not reproduced in my headphoes. I assume that there should be, somewhere, a setting (stage setting) where the external sound (coming from PX5s line audio in) is activated/disactivated. Could you help me? Thanks in advance Giovanni