Okay so this idea is 'relatable' or a good idea or something. But I've been doing it with an added 'step' that blows my mind right now , - so say you have a full-ish tune going, then you put some crazy fx chain on the master channel (because it really brings crazy results/complex sounds) and every possible thing in the tune is effected and it sounds way more interesting than the tune itself - but you're sort of holding back because you built up this whole tune (or idea ) and want that to work aswell -or maybe the fx is still too much eventhough its more 'interesting' - or you consider putting fx straight on the master as too drastic or 'barbaric', unworkable or whatever...
so what could you do to retain the structure and have it go full spazz out fx style too ?
Well, in the way I work, I do all the melody in midi and softsynths - so i have the melody 'seperate' and can just play it from another instrument anyway. .
But in this case I just thought I'd re-map the melody back on top of the whole tune going completely fx crazy, and in that way, sort of have the original skeleton of the tune via the melody parts contained. It does help that the tune is focused on the melody. This means I can just turn it back into being musical again by 'colouring' in the melody in the most important parts and still have the bastard tune sort of 'ruling' the more boring pre fx idea of the tune.