Comment 30 for bug 1481170

The jack branch is not related jet, but it will allow to route the deck stream to a jack effect and capture it by Aux.
For now there is no reason to adopt this "auto fading" to this approach, but it cant hurt to think about it.
Maybe there is a nice idea to improve it.

The LV2 branch will effect this discussion here, because it introduces "unknown effects of any kind"
You may watch the branch here: https://github.com/mixxxdj/mixxx/pull/359