A slice of Berlin’s endless, pulsing underground appears in Cambridge tonight at the Middlesex Lounge, where hardware synth wizard ISABELLA (formerly Sitting Adult) brings her dark, intricate-yet-minimal acid and techno to VAULT, a residency that is taking over Middlesex every second Tuesday from now until people no longer want to dance and feel cool in dimly lit spaces. As the night develops, ISABELLA will transition from her synths and drum machines to a DJ set that will carry you through to the end of a dream, all the way to… well, 1 am, because that’s when clubs close on Tuesday in this city. Byoosik, cofounder of the VAULT residency, sets the mood with a propulsive, raw set that draws on the genre-bending music she heard and vibes she felt during her time in Berlin. Doors open at 9, and in the spirit of Berlin (“come early, party long”) this whole night is FREE if you get there before 9:30, $5 before 10:30, and $10 after that so DON’T SLEEP ON IT!!