krevvy, the “ARA” files you can see outside your project were created by Cubase when the layers were exported out of SL (by drag and drop) - but it’s unrelated to the lossless ARA data itself that SL needs to store somewhere, and the ARA standard recommends storing it in the host project for portability.
Here’s the math, basically:
SL works with float32 data. If you unmix a 4 minutes song into 5 stems, you end up with 6 layers (counting the root layer) 4 minutes long each, which is 6 (layers) *4 (min) *60 (seconds) *44100 (sample rate) *2 (stereo) *4 (float32) = 508 MB.
That being said:
-if you bounce your tracks, including the extracted stems (since they are also assigned as SL layers), completely removing SL after the operation is completed, your CPR file should be back to its original size
-we’re working on a solution to make it optional, so that ARA data could be stored outside the host project as well (but beware that could cause portability issues then)