All this week, I’ll be talking about the artists and events at Montreal’s MUTEK audiovisual festival. There’s nowhere better to begin than at the launch evening of their a/visions series.

Natural landscapes are recurrent themes in electronic music and the metaphors we use to describe them – glaciers and jetstreams. But the Black Forest of Wolfgang Voigt’s GAS, the audiovisual “experience” from the Cologne electronic legend, is an unusually potent descriptor. It’s not so much the real Black Forest’s twigs or leaves or babbling brooks that defines GAS; it’s its density. From its elaborate twirling visual forestry to the saturated sound, GAS is ambient without ever being static, and as deeply enevloping of its visitors as its subject matter.