an (multiband)Unisono effect would be nice!

[crazyfiltertweaker]

An unisono with parameters like

-spread function (to spread the voices into the stereo field)
-voice amount selection
-detuning
-volume/filter of each voice


this effect you can use for many audio sources!

[MeldaProduction]

Well, you are basically describing MMultiBandChorus .

[crazyfiltertweaker]

No, because with a unsiono you can
-detune the voices
-can set different amounts of voices
-can spread into the stereo field

[MeldaProduction]

Well, in that case you may try MMultiBandHarmonizer .