The MIDI PC feature of BIAS FX only works on MIDI tracks in Logic Pro and most of the DAWs,
If you want to use a MIDI Controller to change presets in Logic Pro, please follow the steps below:
1.Load BIAS FX as a MIDI-Controlled effect from the instrument slot of a software instrument channel strip. Once you configure BIAS FX to respond to the MIDI data, you should be all set MIDI-wise.
2.As for the audio side of things, when loading BIAS FX as a MIDI-controlled effect, it will take audio from the side-chain input located on the upper right corner of the plug-in window.