NcH Studios WavePad, available to download here allows the cutting and pasting audio tracks together to form one large file that you can export as a Wave file and then encode into any format you wish with Switch.
Simply open the first file you would like to append the rest of the tracks to and then open the second file and paste the second file after the first, repeat this process with each of the tracks you want to form one large file and then export your file then re-encode the output in Switch to whichever format you like.
I know it might sound complicated, but it really isn't, if you need any more help just post back here again or check the help guide that comes with and you'll be good to go.