I've been trying to find out whether Krishna used a bansuri flute (6 holed North Indian traverse flute), or the venu (7 to 8 holed South Indian/Carnatic traverse flute). I couldn't find a clear answer on Wikipedia.
On the bansuri page it says:
The bansuri-like flute is depicted in ancient Buddhist, Hindu and Jaina temple paintings and reliefs, as well as is common in the iconography of the Hindu god Krishna. it is intimately linked to the love story of Krishna and Radha. The bansuri is revered as Lord Krishna's divine instrument and is often associated with Krishna's Rasa lila dance.
And on the venu page it says:
The venu is associated with the Hindu god Krishna, who is often depicted playing it. This kind of flute is mainly used in South India.The Lord Vishnu is portrayed as Sri Venugopala - playing the flute of Creation.
So what type of flute did Krishna actually use?