APO33 arduino BALTAN BALTAN Labs call for projects concert documentation electronic music exhibition festival FLOSS Free/Libre/Open Source Software free software fritzing GOTO10 hardware hacking improv installation LGRU live art motion tracking noise open call OpenCV Open hardware open source performance Piksel09 Piksels and Lines pixelache presentations Pure Data release research residency software art streaming techno video video effects video NLE volunteers workshop workshops xxxxx