When using Pro-MB as downwards expander with only a single band covering the entire spectrum, the attack transient seems to get boosted even though range is negative and band level is 0 dB.
The problem is 100% reproducible with a simply decaying sine input. Threshold, ratio or knee seem to have no effect. I used attack 1%, release 20%, lookahead 20 ms. Reducing lookahead reduces the boost but only turning the lookahead function completely off seems to remove it.
Is this intentional? Can I avoid it while keeping lookahead?