Because Music maker only support 16 bit for professioanl level we have to use (if needed) Magix Samplitude softs.
I do use Acid 24 bits loops which I convert to 16 bit to be used properly in Music Maker.
Trial version and Pdf help files is meant to clear everything before we place order.
If you want to do manual work, drag and drop your one 24 bit audio on music maker arranger and export it in wave or mp3 repeat the process to convert all of yours audio. It worked with me but I prefer my Creative audio converter that can convert audio in Batch mode too.