Thanks Alex, I knew there were some mods for that. I just bought a new VCS about $15, a SECAM I guess i'm in france. It's black one I'll use it exclusivly for mod, I'll try to make a standalone synth, I need to look for keyboard padle shematics, (I only got joystik and tennis padle) to make a built-in key on the VCS, with pitch, circuitbend matrix patch... That an idea... The mod of TV switch is quite simple thanks a lot, I was to lazy to google it, anyway all google search about atari bring me back here, on this wonderfull forum.
Maybe some people in america are looking for a SECAM, I can make an exchange...
What do you think?