Thank you very much for answering James, I was experimenting with my sound card and my computer and I was surprised how well it works !, Laserboy dxf transforming a vector image into sound and can do a test with the oscilloscope to make a quick test, now if, I have much more clear how it works and I still work and experiment with homemade Galvos. I am extremely grateful to you and this forum, luck and success !.