If you select an effect and press edit you can tailor the parameters and save it in a user memory slot shown in the screen. If you select an effect and scroll down to Effect Memory that is where the user effects are found. Thus Chorus, Multi, Reverb have 10 user memories each and DSP has 20. Thus the effect memory file contains all these 50 user settings.
Digital Effect is applied in the sound edit and is a different animal in that respect.