Topic: Babyface for the midi connections

I connect a piano to my computer using a midi system. If I connect the piano directly to Babyface using its midi in and out, when I play the piano, Cubase adds very loud notes or chords which remain until I stop recording. If I use a traditionnal Midiman 2x2 for connecting the piano midi cables,keeping Babyface only for the sound, Cubase doesn't add any disruptive chord.
So I can keep on using Babyface as a sound card, which is well, but I would have liked to be able to use it for the midi connections too, directly. Do you know what to do about that, thanks.