On the phone from his home studio in Los Angeles, Butch Vig admits with a chuckle that “the muscle memory has been pretty slow to come back.” Yes, the seven-year hiatus that Vig and his bandmates in Garbage took between albums seems to have left the electro-rockers a little rusty. But the Grammy-winning producer is having so much fun playing with frontwoman Shirley Manson and his cohorts Steve Marker and Duke Erikson again that he assures us by the time they play at a sold-out Paradise on Saturday, it will be all systems go.