Urbanears has introduced Slussen ($15), a stylish-looking portable DJ adapter with a free companion app. Slussen plugs into an iOS device, using two 3.5mm jacks to connect headphones and a sound system. Upon launching the app, users can hear one song through headphones while another is playing through the speaker. The app allows music to be controlled in a number of ways, by adjusting BPM, syncing tracks, and EQ effects; a scratch function, crossfaders,…
