How to increase Buffer size

[IanMelb]

My DSub client plays fine when connected to the WiFi but pauses for a few seconds when playing from Mobile/3G data. It's not a problem with the phone lowering the volume for other events, if I replay the song from the start then it plays without interruption if it has had time to download more completely.

Decreasing the bit-rate doesn't seem to have much effect.

Is there a way to increase the buffer size? I've been through the settings but cannot see anything obvious.