According to the official support website, there are some cases while using turntables without 78 rpm settings, in which you will need to use a third party tool like Audacity to properly edit your files. In this case, after you installed the Audacity application and recorded the song that you want, you need to open the program, go to Edit > Select and choose All. Next, you need to open the Effect menu, choose Change Speed and select 78, then press OK.
If this isn't your case, contact the developer using information from the official website for further support.