OK, now that you have all of them decoded, open r8brain and hit browse and select the first .wav. Set 'resample to' 44,100, output bit depth to 16, use 'very high quality', then click 'batch', then click 'r8brain batch' It will take a while, at least an hour. And as I said before, you may want to archive the 24 bit FLACs for future use.