Ok have been experimenting with this and trying out all the options and this is what I get
copy and paste a current slot = takes a copy of the performance with modifications to some stomps - but not stomps that have a parameter controlled by a pedal, ie wah, pitch, etc - and not the current setting of the morph pedal
copy & paste a current slot you want to modify ( leaving your existing performance in take ) - save new slot with new name - modify new slot - save as = saves all parameters - but not stomps that have a parameter controlled by a pedal, ie wah, pitch, etc - and not the current setting of the morph pedal
now I except that wah , pitch, volume, morph are parameters that in some circumstances you don't want to copy but leave in their default zero position
however sometimes it would be great to copy the sound you have achieved with all the pedal parameters as they are set at that time , ie a SNAPSHOT of the exact sound you are achieving at that setting of all the parameter settings, knob, button, pedal as if you want to save this as a new performance slot so when you click on it you go straight to that sound you had created and not then having to make 3 to 4 pedal adjustments to get back to the sound which is nearly impossible to recreate, one pedal slightly different will create a totally different sound.
So I guess I am asking for a Performance Snapshot button - taking a snapshot of the exact sound coming out of a performance - freezing the pedal positions for all tweaked parameters including morph.