I'm not sure if most new S4 users have noticed or not, but in S4, the EFX are defined differently than in Traktor Pro. The EFX sit after or Post EQ and Filter, where you can't manipulate the sound anymore after using EFX which use buffers (Delay Freeze, Turntable, Beatmasher at 100% wet, etc). There is already a discussion and video about it here by gmint, http://www.native-instruments.com/forum/showthread.php?p=765413#post765413 but after figuring out that this isn't a bug, I thought I would post here and suggest the following improvement options: BEST: make a smart EFX, where the EFX is Post EQ/Filter (as it is now) and Pre after the buffer has kicked in (e.g. during Freeze)... so, best of both worlds. BETTER: make an option where we can choose to make the EFX Pre (Traktor Pro) or Post (Traktor S4). GOOD: Go back to Pre EQ/Filter, like in Traktor Pro Please send a feature request to NI to at least go back to how Traktor Pro's EFX where defined, so we can have back the control of using the EQ/Filter on buffer using EFX.