Sylenth cutoff knob

[zack_123]

Whenever I start playing through the plugin it turns the cutoff knob on the filter control down. Have I accidentally turned on a setting in the plugin that does this?

[vegaron]

I think, you may accidentally have turned on an automation line with that specific control. I would check on that.

[Lennard]

Right-click the cutoff knob, then select "Midi Forget" to unlink the midi automation.
Still, something in your setup is sending midi data to Sylenth1, obviously without you knowing, so you may want to locate the source of that too.