1. MDX-B algorithm produces only vocals and instrumental after last update. It's because other 3 stems (bass, drums, other) work not so great comparing to Demucs4. You still can access old MDX-B (4 stems) at Old Models section.
2. We added Kim_vocal_2 model (trained by Kimberley Jensen) and some other UVR MDX models. Kim_vocal_2 is now used by default.
3. We upgraded MDX processing using overlap=0.8, so it produce higher SDR. For example Kim_vocal_2 alone gives: 9.60 for vocals and 15.91 for instrumental on Multisong dataset.