Packing a folder will simply place regions onto one 'track', but you will not be able to compile the files. Do this. Create a new audio track. With the replace X button disabled (on the transport), record a short blank audio region. Then record another one. The goal is to create a blank take folder on the new audio track. One you have a 'silent' take folder, simply drag you vocal audio regions onto the 'silent' comp region. Viola. Each region you drag will become part of the take folder. Comp away.