Here's another response from a Maestronetter:

Can you give an example of a piece which uses it? If I understand what you're referring to, I think I remember a passage (several) that uses it in Polonaise by Wieniawski. It's détaché (forget about spicatto, it would never compare) and extra raspiness is acheived on the G string, close to the bridge. It's often accompanied by KTCHUH sounds on the attack by the bow, right?

I don't think it's col legno either because the wood on string, which is a very cool effect, isn't scratchy or harsh as Geoff described. It's whispery and somewhat metallic in effect--col legno, that is.

Geoff, I'll check out that recording.

Bow regards,
WordWolf wolf tones are a great topic of discussion among musicians and fiddle makers