syn thes izer ) ▁util izing ▁Yam aha ' s ▁Advanced ▁Fre quency ▁Mod ulation ; ▁Advanced ▁W ave ▁Memory ; ▁and ▁the ▁combination ▁of ▁these ▁two ▁systems , ▁either ▁by ▁layer ing ▁together ▁or ▁by ▁mod ulating ▁an ▁A FM ▁voice ▁by ▁an ▁A WM ▁wave , ▁a ▁syn er gy ▁term ed ▁Re alt ime ▁Con volution ▁and ▁Mod ulation ▁Syn thesis ▁( RC M ). ▁The ▁unit ▁came ▁into ▁production ▁in ▁ 1 9 8 9 , ▁simultaneously ▁with ▁the ▁SY 7 7 . ▁ ▁The ▁ 7 7 ▁series ▁( and ▁its ▁successor , ▁the ▁SY 9 9 , ▁feature ▁various ▁filters , ▁which ▁digit ally ▁model ▁those ▁of ▁analog ▁equipment ▁and ▁include ▁the ▁popular ▁feature ▁of ▁self - osc ill ation ▁from ▁the ▁latter . ▁Each ▁of ▁up ▁to ▁four ▁Element s ▁within ▁a ▁Vo ice ▁can ▁have ▁its ▁own ▁filter , ▁which ▁can ▁be ▁controlled ▁by ▁a ▁dedicated ▁en velope ▁generator . ▁The ▁T G 7 7 ▁is ▁equ ipped ▁with ▁two ▁sets ▁of ▁s tere o ▁outputs , ▁like ▁the ▁SY 7 7 , ▁and ▁is ▁en hanced ▁compared ▁to ▁the ▁latter ▁by ▁having ▁eight ▁individual ▁outputs , ▁which ▁are ▁assign able ▁to ▁individual ▁internal ▁instruments . ▁Like ▁the ▁SY 7 7 , ▁the ▁T G 7 7 ▁has ▁a ▁large ▁L CD ▁display , ▁and ▁programming ▁takes ▁place ▁through ▁a ▁key pad ▁on ▁the ▁front ▁panel . ▁ ▁The ▁SY / T G ▁series ▁can ▁generate ▁rich , ▁layer ed , ▁mult it im br