though i have a lot of high gain patches na ok naman yung tunog through amp. pero panget sa headphone xD
ako nalang sasagot sayo bro.. kahit anong multi-effect gamitin mo, iba talaga magiging tunog pag through headphones.. may frequency response kasi yan.. your headphones may not capture the lowest frequencies na naaabot ng amp kaya minsan matinis ang dating, lalo na pag distorted.. maliit lang kasi speakers ng headphones compared sa amp.. gets?.. ayun.. hope i got to answer your question..
same thing kung bakit iba-iba tunog ng mga multi-effects sa iba't-ibang amplifiers..
kahit same EQ, same settings, same patches, same guitar, etc..