Wavetrac diffs are not "Locking" but rather torque biasing and will bias torque on decel as well as accel. What is unique to the wavetrac is it employs a set of clutch packs on each end of the gear cluster which act as an lsd in near zero torque situations.
I send a mail to your company about the purchase of the diff and about some udder items. The S4 engine and the 6spped tdi gear box left Madrid this tursday and gone be on my little island in about a 10days. Now I'm gone consentrat on adapting a set of Porsche 996 brakes and 18" to my little car until the engine get her.