FL Studio has a great feature where you can use the "Select Notes" tool and click on any piano key to instantly select all notes in that key. This has become incredibly useful for me.

Recently, I’ve been using Signal to edit MIDI files more easily, since it’s specifically designed for MIDI editing—unlike FL Studio. While Signal makes many tasks much simpler, I really miss that FL Studio feature. In Signal, selecting notes often means having to zoom out and manually click around, which feels clunky by comparison.

Feature in FL Studio:

Mockup in Signal: