dear @BeatMaster and Friends:
After thinking about your problem, analyzing and testing, I apologize for my answer, I had not understood your problem correctly.
I think you mean that when you preview from the song screen you cannot apply the effects that you mention, the button flashes but the effect does not apply,
I have verified that the “NOT working” is correct, with version 3.1 no effects are applied, although I never use this preview option (I load the song on the deck and listen to it, neither they are applied if I have the Channel Fader down)
I was not aware that in previous versions it allowed you to apply effects such as the filter etc… Personally I think that for me it is not something useful, although if it worked before,
I understand that it should work now with 3.1 It is It is very possible that since the effects were closely related to the mixer, that having completely redesigned this section in 3.1, now it is not possible to use it, although
I suppose that @denon staff should explain better if this question is possible, or if you have to give it up in favor of the new improvements (which are many)
Summary: the only way to use any effect is to raise the Fader of the channel itself. Like the sampler, now it comes out directly from the master output, before you could apply effects to it since it came out through channel 4, now it’s much more comfortable, even though you can’t apply effects.
I guess you’ll have to get used to it, but of course I don’t recommend that you stay at 3.0.1, regards
Edit
sorry for the big paragraph, I’ve read the answers late