Typing smartvox.eu into the address bar of the browser of several phones, tablets and/or computers simultaneously is a simple way to understand what this web application is about: the different parts of the same musical score are being synchronized over the internet, through a remote server. This form of music making falls under the category of net-worked music performance, and addresses questions regarding what becomes a live performance of chamber music when musicians are distanced from each other, when sheet music is replaced by screens and headphones, or when the form of the piece is generated live by algorithms. The scores, composed in the Bach environment, display a scrol-ling playhead in proportional notation, bypassing conventional bars and beat rhythmic notation. Providing the performer with audio-scores and animated musical representation undoubtedly simplifies and speeds up the rehearsal process, but large forces (such as 80 simultaneous connections) and the constraints of a concert situation still leave numerous technical problems unsolved (mainly concerned with synchronization between devices, and server saturation), to which the present paper will attempt to partially formulate a response.