a good effects chain depends on YOU..there's no right or wrong way to do it. for me to achieve a good sound, usually
1st filter effects like phaser, wah....i put phaser 1st
3rd OD/Distortion,
4th Equaliser,
5th Pitch effects like harmoniser, vibrato,
6th modulation effects like flanger, chorus..usually flanger b4 chorus for me
7th sound level controllers like noise gate & volume pedal..noise gate b4 volume pedal
8th echoes are delay and reverbs..i put reverb after delay..
if u follow this thing nothing can go wrong with your tone..but the tweaking part is up to u..
and again there's no right or wrong way for effects order..those are juz my preference..i think they should be in dat order..if u guys ask y, then i'll tell u y..
so there siva..u decide multifx b4 or after ds..u can apply both ways in different situations if u get wat i mean..