For example, when I create an amp send fx to a bass track, I was able to hear the only fx channel by pressing the L button in the mixer before. However, idk since when but it started to not work correctly and all I hear is the source dry bass audio.

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I already setup my audio connections and control room long ago according to this video and other helpful videos https://www.youtube.com/watch?v=oz83ocFmJQs which is a little outdated so I made sure from Studio > Audio Connections > Outputs not connected > Control room enabled & left and right channel properly selected to my interface.
Like I said no matter what kind of fx I insert (pre or post insert) on the bass amp fx channel I want to solo, I don’t hear any fx at all. I also changed pre or post fader send but nothing seemed to change.
When I solo the amp fx using the S button in the mixer, I finally can hear the amp fx with the source material together but it’s not ideal for adjusting the amp fx sound. I only want to listen to the fx audio.
Someone tell me what is wrong with my setup or what I’m missing in this case please!
P.S.
I updated Cubase to the latest version yesterday, but this function has been failing since months ago to this day.

