the header for the bg file goes to 7ac hex and 1964 decimal (the first letter after that address is a small x - if its not then somethings wrong). i simply delete this then run it through rcotool to decompress it and what it spits out can then be loaded into tgawavecs. if you want to do the whole file by hand its a bit harder. your file is different somehow (t has several bytes extra so i suspect this is what is causing the glitch - perhaps the image start is being lost because of the extra bytes. im gonna mess about with adding those extra bytes into my own wave and see what happens.