auto play when transferring wma

I have itunes 10 and it automatically plays wma Overdrive audio books when I transfer them so that the books take hours to transfer. I have set itunes to " and to "Manually Manage Music and Videos" and "AAC Encodert"/"Spoken Podcasts". Overdrive told me to disable the function of playing music while importing stuff but I cannot find this option anywhere. The person at Overdrive told me to look under "Import Options" or "Advanced" preferences but neither of these places has this kind of option. Apparently, I cannot even ask Apple how to do this without paying - there is nothing listed under "Help". Can anyone help? Thanks in advance.