Yo MASTERLINK? [you're not the person making those are you?]
He He He, just kidding.
I've noticed that on some recorders, like my MD-8, and probably others as well, that you can hear effects if you want to hear them while recording a vocal or another track, etc. However, the effects are NOT RECORDED; you can add them or variations of "them" at mix-down.
Now, the MD-8 will also record effects as the track is recorded if you want to do that; you can add more effects at mix-down; BUT, as noted above, you start to get mushy and the words of the vocalist seem to melt into an ocean of mumbles and jumbles.
I use two effects units since the MD-8, as well as other units, will accomodate them; and, I've often bumped in effects from both units during mix-down when I find something good, usually by accident.
As the good people on this site have said over and over, mixing your final product of 3 minutes can often entail three days, three months, or longer. Depends how much time you have and exactly what you want to hear.
Have phun, [fun} it would sound like PHUN if you over do the FX.
Green Hornet