sustain pedal triggering mute?

I have Cubase 8 and omnisphere 2.

When I play a sound in omnisphere and press the sustain pedal the mute button
lights up and cuts off the sound.

It only happens with omnisphere. All other vst instruments work fine.

Why is my sustain triggering the mute function?


Ok it’s not just omnisphere. It’s whatever instrument is on the first track.

The first track says “S1 mute” on the panel… the tracks after that just say “0” and they all work correctly.

I have no idea how that started happening. I don’t remember programming anything like that.