If so.... Been a while since I looked at those. They are meant more for isolating a phrase and looping it to get it down. Not as much for music minus one creating. They are tools that a beginner could use to learn parts off of recordings. Many folks would use the tools (slowdown, replay, etc.) in YouTube or most music players to do much of the same work. I use Transcribe! to tackle tougher stuff.
Karaoke software kind of removes the lead vocals in a finished mix. That could be applied to dobro recordings. They work on the most prominent audio in the recording and suppress the volume. It takes a lot of other stuff with it and also leave artifacts from reverbs and delays lingering in the finished product frequently.
There are a lot of tools used by sampling and re-mixing producers which could work. Roland Re-Mix is one I have used. It is based on spectral analysis and you can visually decide what parts to take out or isolate. There are others from folks like Melodyne. Thes work usually in a DAW package as a plug-in. SOme are standalone. Not cheap.