Bass drums – none
Snare drums – some reverb and a little delay
High-hats - none
Percussions – reverb
Bass – none
Vocals – reverb and some delay and a little chorus
Guitars – chorus, reverb delay
Strings – a little reverb and depending on the song, some chorus
Piano/keys reverb chorus

All of these uses of effects really depend on the style of music and the mood you are trying to evoke.
If your keyboard or software sequencer program has a lot of effects you can play around and be very creative and innovative. For example, on the triton, you can use effects to totally change a sound.