Bass pitch

[Martin]

I have been looking at Chordino plugins for chord and chord note estimation using Audacity.  I would welcome help on modifying the plugin in order to label the note estimation track with actual midi notes rather than (or as well as) the midi note numbers.  It would also be a great help to be able to isolate the lowest note in a chord in order to get a good bass line part.
Martin

[Vampire]

have you looked at Matthias' pyin?

this is great for bass pitch as it is monophonic pitch tracker - but it is designed for separate bass parts - are you hoping to gte bass from a fully mixed audio track?