Also ability to see the list of overdubs and being able to clear at least the last one. For very advanced feature it would be really cool to be able to crossfade between overdubs or layers. For example by creating aribitrary scenes A,B,C,D and then assigning which of the layers are active once one of the groups is activated or faded into. For example scene A - layers 1,3,5; scene B - layers 2,4,6. Then you will be able to slowly crossfade between each scene by either changing a parameter or feeding it an LFO. In the case of 4 groups you could imagine that there is a square and every corner has scenes A, B, C, D. To crossfade between them all you would need is ability to move around X and Y axis, hence with just 2 modulation inputs you could move anywhere in this square.