Google Chrome refuses to use CM106 Like Sound Device

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http://www.linuxquestions.org – My Kubuntu 13.04 Acer Aspire One 753 laptop is connected to a Toshiba U10 Dynadock port replicator. Everything (excl. VGA over USB, i.e. 'DisplayLink' in MS Windows parlance) works perfectly - Audio, network, USB ports etc. Google Chrome insists however on playing all its audio through the 'Built-In Audio Analogue' device, rather than over the USB and out through the Dynadock's audio. This is most annoying, e.g. using YouTube, iPlayer. Has anyone else experienced a similar problem, where Google Chrome won't play out of 'external audio' devices? Many thanks for any help. (HowTos)