By IAN YEE and DANIEL SUBRAMANIAM alltherage@thestar.com.my BARELY two years ago, YouTube duo Karmin were flat-out broke. Singer/rapper Amy Heidemann was working as a wedding singer while playing in a girl band, and her partner-in-crime Nick Noonan was trying to make a career for himself as a jazz trombonist. “All we had was a US$99 […]