A method of managing a digitally-streamed audio communication session between a plurality of user devices (7a, 7b, 7c), the user devices being configured to send digitally-streamed data indicative of received audio contributions from respective participants in a multiple-participant audio communication session to a multiple-participant audio communication session controller for processing and onward streaming of data indicative of said received audio contributions from said session controller to one or more other user devices for conversion to audio representations for respective other participants of said received audio contributions, the data (21, 22) being streamed from the session controller to the respective user devices having one or more audio parameters affecting the audio representations provided by said at least one user device to a participant using said at least one user device; the method comprising: identifying, from streamed data received by said session controller in respect of successive audio contributions from respective participants, time measures indicative of start-times and end-times in respect of said audio contributions; determining, from time measures identified in respect of a plurality of audio contributions, respective disparity measures, each disparity measure being determined in respect of a preceding audio contribution from one participant and an immediately-succeeding audio contribution from another participant, the disparity measure in respect of a preceding audio contribution and an immediately-succeeding audio contribution being indicative of a disparity between the end-time identified in respect of the preceding audio contribution and the start-time identified in respect of the immediately-succeeding audio contribution; and adjusting one or more audio parameters in respect of data being streamed from the session controller to at least one of the user devices whereby to affect the audio representations provided by said at least one user device to a participant using said at least one user device, the adjusting of said one or more audio parameters being performed in dependence on said disparity measures. identifying, from streamed data received by said session controller in respect of successive audio contributions from respective participants, time measures indicative of start-times and end-times in respect of said audio contributions; determining, from time measures identified in respect of a plurality of audio contributions, respective disparity measures, each disparity measure being determined in respect of a preceding audio contribution from one participant and an immediately-succeeding audio contribution from another participant, the disparity measure in respect of a preceding audio contribution and an immediately-succeeding audio contribution being indicative of a disparity between the end-time identified in respect of the preceding audio contribution and the start-time identified in respect of the immediately-succeeding audio contribution; and adjusting one or more audio parameters in respect of data being streamed from the session controller to at least one of the user devices whereby to affect the audio representations provided by said at least one user device to a participant using said at least one user device, the adjusting of said one or more audio parameters being performed in dependence on said disparity measures.