Hey djlogix, I bought the sound interface that comes with the chinese voice over, found solution and it sounds english now~ Download this file (no virus) and save it to SD card, put it into the SD card slot on your interface, press MODE button few times till u hear BEEP BEEP BEEP BEEP, then power off and turn back on, voila~~ ENG VO file: https://www.dropbox.com/s/p17436j1m1bf988/jl_bt46.bfu Video demo: https://www.dropbox.com/s/u0i90ckb40v5yg1/IMG_8646.MOV Im currently working on the contactless fader using IR slot sensor, found this with logic output so the respone is fast and sharp, 0.5μs max rise and fall times, not as fast as some of the others (some others with just 10nano second!!!) but Im very happy with that IR slot sensor: http://uk.rs-online.com/webdocs/1327/0900766b81327ae2.pdf Demo: https://www.dropbox.com/s/2bo3cb5uy2sc3oc/IMG_8649.MOV Circuit on breadboard: https://www.dropbox.com/s/gambeqbd2tspete/IMG_8650.JPG Fader(IR sensor switch): https://www.dropbox.com/s/njqkzl8n6dq3wg2/IMG_8651.JPG Im still looking for a accurate circuit for the start stop button, anyone know any circuits for momentary push switch as start/stop button work with low current? Ive tried IC555 but its not very accurate, and will try to put a keyboard switch as the start/stop button, its lightly press force and tiny in size: http://uk.rs-online.com/webdocs/1122/0900766b811227e2.pdf