I had this problem: i wanted to add elements in the making of the loop without erasing the precedent ones...
When you set a loop in the arrangement view and record clips in it, each time a loop begins you will erase what was written before in the same track...
So i did like this...
1-8 pads of the finger trigger are assigned to Impulse using Midi Channel 10
2-I made a live set with 8 midi channels with simpler in it, the first one is receiving midi from finger trigger channel 1, the second one from finger trigger 2 etc...
3-8 pads of the trigger finger are set to send C1 note message, the first one through channel one...the second through channel 2 etc...
4-So each of these pads triggers a simpler sample of your choice...(you can have full controls on your samples)
5- you create a scene with clips with the same quantization and same number of bars....and here u go...
you can even apply record quantization to each sample...as everything is triggered through midi...
here u go...mpcesque simulation...but you can have different effects on each track etc....