Music creation marketplace Splice – whose music production platform is used by more than 3 million people – has acquired tech firm Superpowered, which powers the audio for thousands of apps that, it claims, have been installed billions of times. Founded by Patrick Vlaskovits and Gabor Szanto, Superpowered has previously raised financing from investors like TechStars Music and counts key clients such as Tencent, Beatport and others.