On my DJM800; Don't use: Chrous, Rev Roll, Robot, Reverb, and i try to stay away from the phaser/flanger but it never happens, love it too much Send/return gets used for the effects unit Woot. Haven't really figured out an advantage for; Delay (I'm obviously using it wrong, i just can't seem to make it work for me.) Bitcrusher colour (Can't find the right sounds to use this on) Harmonic colour (Will experiment with this once i learn more on looping.)