Processes and compositions are described for use in foodstuff flavors and as foodstuff article aroma and taste augmenting and enhancing materials of at least one .alpha.-oxy(oxo) sulfide and ether having the structure: ##STR1##wherein X is one of: ##STR2## Z is one of sulfur or oxygen; when R.sub.1 and R.sub.2 are taken separately, R.sub.1 is hydrogen or methyl, and R.sub.2 is methyl; and when R.sub.1 and R.sub.2 are taken together, R.sub.1 and R.sub.2 form phenyl moieties; and Y is one of C.sub.1 -C.sub.4 alkyl, C.sub.3 or C.sub.4 alkenyl, acetyl, methoxycarbonylmethyl, or 1,3-diethylacetonyl.The compounds of our invention are useful in augmenting or enhancing the flavor and aroma nuances of berry flavors, cereal-like flavors, nut flavors, broccoli flavors, onion flavors, citrus flavors (including neroli, bergamot, lime), jasmin flavors, grapefruit flavors, concord grape flavors, blackcurrant flavors, milk caramel flavors (e.g., dulce de leche-like flavors), vegetable flavors, cucumber flavors, celery flavors and spice flavors.