According to the pustak of Vd Prabha Atre ___ Page 13-14 :
Bol alaap , Bol taan , Bol baant , Bol banav , Bol upaj

https://www.youtube.com/watch?v=BHthX-AN8o8 - How To Make/Practice Bol Aalaap In Any Raag | Tutorial #126 | Online Lesson | Siddhant Pruthi ( Yaman )

https://www.youtube.com/watch?v=9ljQhfPUnLA - " Learn Bol Taan & Baant in Raag Kausidhwani | Aayo Ri Basant | Anol Chatterjee " ( also aakar taan )

https://www.youtube.com/watch?v=iP_keox_mEs - " Bol Banav Bol Baant Bol Taan improvisation ideas " - Jayaa Jain ( Ramkali , Bihag )

https://www.youtube.com/watch?v=M1jhqCTC1BU - Bol alaap , Bol banaav ( Raga Quest )

___ Bol banav : = ... leisurely ( P Atre ) , beautifying the lyrics ( found on the net - Pdf ) .
Can´t find a more detailed description . If I am not wrong it is being sung in a more playful manner , more shringar raas ... ( ? )

___ Can´t find any video with Bol upaj , but according to Atre " bol upaj " is for serious classical and bol baant is for light classical ; both being somehow similar .

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