peter
I agree Peter, latency is always something to keep in mind. I have been very impressed with the UMC 404HD, and down right amazed for the price point. My main use case for the unit is a live setup (Not using the monitoring feature) and have had no issues.
Bass88,
Here is a quick description of my setup. I have all of the live performer’s mics/instruments going into the UMC 404HD. The UMC goes into an iPad (usb and camera kit). On the iPad, Audio from the UMC and Stage Traxx is then brought into AUM. Any routing and effects are added in AUM. Then the AUM outs are routed to the UMC outs and to my Bose PA. (Since I am using the iPad for Stage Traxx, why not use it for the mixer too and not have buy/deal with another piece of hardware)
I also have midi control surfaces to control Stage Traxx and AUM during my performance. I have connected these via USB in the past, but now use BlueTooth MIDI using Yamaha’s UT-BT01 and MD-BT01.