the effect i use most often is the bit grunger on 2 or 3. i like how it makes stuff all squishy
i rarely use the compressor, it sounds kinda weak IMO (im used to analog stuff or UAD plugins). i usually only turn it on if i put together a beat and see it's way too quiet when i look at my mixer's meters. so i'll turn on the compressor, not really hitting it at all, just for makeup gain. sometimes there's just too many channels in the mpc's mixer being used to adjust every single one to make up gain. i end up losing my balance between the tracks if i try. so i use the compressor's makeup gain instead. not perfect engineering-wise but whateva
the reverb is a little weird. when i use it i usually leave it pretty dark and quiet in the mix. i do like that i can send FX1 to FX2 if the reverb is FX2.
flying pan, oh yeah i use that one on every single song

hmmm i just noticed how close it is spelled to "frying pan." maybe it's a japanese thing...
i hate to admit it cuz i dont like saying bad stuff about the mpc but they really should have included a delay in there. i could have lived without the chorus and flanger, but rather had a echo delay. who the hell uses flanger nowadays anyway? (well, maybe a really crazy flanger every now and then, but not the kind they put into the 1k). i havent used a chorus on anything since band practice in 1991. it was even cheesy then!
the eq is ok, sometimes. i havent used it yet on fx1 or fx2, only on the master section. i dont like how it makes stuff sound smaller. but again, im used to fancier eq's and effects in general so i guess im a snob
not what you were asking 247, sorry