Switch the select flag of the i-th item in the list
associate_list is the list of possible outputs
Requires an initialized loader
Function that checks if every input is associated at most once
Functions that create the final binding between the file and the required channel, this function must be called after having checked that there is no double association, else, thoses will be overwritten without warning
returns a channel, given its index
Returns a dictionnary containing all the required parameters required for channels