RB.TrackTransferBatch::cancelled

def callback(track_transfer_batch, user_param1, ...)

Emitted when the batch is cancelled.

hmm. will 'complete' still be emitted in this case?

track_transfer_batch :

instance of RB.TrackTransferBatch that is emitting the signal

user_param1 :

first user parameter (if any) specified with the connect() method

... :

additional user parameters (if any)