Hi Sergio, I don't know if you have gotten a response, but I have been thinking about this question in the past few days because I am looking for a new looper. Based on my research, I do not own either of these yet. As I understand, the 2880 and 45000 have four "tracks" and a master which are refered to as one "loop." These tracks are syncd together, and they must all be the same length. They can play together, or separately, but they CANNOT play one after the other. So, for example, you cannot record a verse on track 1 and a chorus on track 2 and then play them one after the other. You can do this if you use the 45000 and record one "loop" for the verse--which can contain four tracks--and one loop for the chorus--which contains four more tracks. Then, using the foot controller, you can switch back and forth between your first loop for the verse, and your second loop for the chorus. In contrast, the boomerang III has four possible loops at the same time. These loops can be played together, or one at a time one after the other depending on what mode you're in on the rang. Each loop can contain any number of layers which are similar to the "tracks" on the 45000. You can stack on your loops, but the individual layers cannot be panned like the individual tracks can be on the 45000. One advantage of the rang is that you can use the sereal sync mode which allows you to have one master loop which can be played at the same time as the other two or three sereal loops. This is called parallel loops. Depending on the mode you're set in, the rang can play parallel loops of different lengths and they don't have to be syncd. This is, in my opinion, the most important difference between the rang and the 45000. On the 45000 each of the 4 tracks in a "loop" must be the same length. Your "loops" can be different lengths, but they cannot be played at the same time or "parallel." So, with the rang, you can create your master loop, maybe a percussion track, and it will play while you switch from loop to loop to loop verse, chorus, verse style. Now, granted, you don't have the same flexibility of mixing your various layers in one loop like you can with the 45000, but that's not important to this loopmaker at this time. Another big difference to many is tha tyou can't save loops with the rang, but this loopmaker doesn't care right now. :-) Rusty On 5/21/13, Sergio Girardi <email@example.com> wrote: > Hello everybody, > > I was trying to sell my Boomerang 3 to a friend who is now interested in > the > Rang3. > I > am pretty sure the Rang 3 is more versatile as a looper and that the > 45000 cannot handle the 4 tracks in many different ways as the Rang can > handle its 3 or 4 separate loops. > But this of the 4 tracks vs 4 loops had already confused me at the times > of > the 2880. > My friend for example insists that the 45000 has got 4 separate loops. > Could anybody help me in understanding the differences and advantages of > these two loopers? > Thanks!