▁electron ics ▁of ▁Gar cia ' s ▁Ir win ▁gu it ars ▁are ▁unique , ▁and ▁feature ▁an ▁on board ▁pre amp ▁and ▁effects ▁loop . ▁Much ▁like ▁a ▁Str at oc aster , ▁the ▁three ▁pick ups ▁are ▁selected ▁with ▁a ▁five - way ▁switch . ▁ ▁Sign al ▁from ▁the ▁pick ups ▁passes ▁through ▁the ▁tone ▁controls , ▁followed ▁by ▁an ▁op - amp ▁based ▁buffer ▁pre amp , ▁or ▁unity ▁gain ▁buffer , ▁which ▁is ▁designed ▁to ▁prevent ▁signal ▁loss ▁due ▁to ▁capac it ance ▁when ▁long ▁c ables ▁are ▁used . ▁From ▁the ▁pre amp , ▁the ▁signal ▁could ▁be ▁rout ed ▁via ▁a ▁mini - toggle ▁on ▁the ▁guitar ' s ▁face ▁to ▁pass ▁through ▁a ▁Y - c able ▁to ▁Gar cia ' s ▁effects ▁ra ck , ▁and ▁then ▁back ▁into ▁the ▁guitar . ▁ ▁This ▁on board ▁effects ▁loop ▁serves ▁to ▁send ▁the ▁full ▁output ▁of ▁T iger ' s ▁pick ups ▁to ▁the ▁effects ▁while ▁allowing ▁the ▁guitar ' s ▁volume ▁control ▁to ▁vary ▁the ▁final ▁output . ▁ ▁The ▁effects ▁loop ▁could ▁be ▁by pass ed ▁by ▁the ▁a for ement ioned ▁switch , ▁sending ▁the ▁guitar ' s ▁signal ▁from ▁the ▁pre amp ▁to ▁the ▁volume ▁control , ▁and ▁then ▁out ▁to ▁Gar cia ' s ▁pre amp ed ▁( and ▁heavily ▁modified ) ▁F ender ▁T win ▁Re verb ▁into ▁a ▁Mc Int osh ▁MC 2 3 0 0 ▁solid ▁state ▁power ▁ampl ifier . ▁T iger ▁started ▁with ▁Di Mar