FR: Add ability to record midi looped overdub

[Fourdogslong]

It would be very useful to be able to record a fixed lenght midi clip in overdub loop mode. Meaning that the clip would keep recording over and over until manually stopped, and everything played would be added over what was already there (without erasing it).
So for example, the lenght limit could be set to two bars.
The first time the clip record you could play the kick drum.
At the end of the two bars, the clip would loop and keep recording, so on the second pass you could play the snare while hearing the kick you recorded on the fisrt pass.
After that second loop, you would record the hi-hat while hearing the kick and snare you recorded on the two previous pass, and so on and so on.