In this demo, we present ProXoMix an interactive installation where participants equipped with a mobile devices remix a piece composed of complementary loops by moving in an empty space. The up to 24 participants embody and control each one track rendered over earphones. A lowpass filter allow them to modulate the timbre and presence of the looped track by tilting the mobile device. When two or more participants (i.e. their mobile devices) come closer to each other, their tracks and its modulation appears in each other’s earphones. This way, the installation allows for collaboratively performing mixes of the tracks creating social-musical assemblies and spontaneous choreographies. The mobile application dedicated to the installation uses Bluetooth beaconing to estimate the distance between the mobile devices.