I need help on how to connect Focusrite Scarlett 2i2 TO 24 channel Alto Professional Live2404 mixer and record a live concert of 5 mics, drum, 2 keyboards, a lead guitar and bass guitar on Logic Pro X?
From the start, this will suffer in sound quality and you will have almost no capability to work on separate tracks after recording. Unless you record each part separately on a different track. But here goes... Go to the store and buy a TRS to XLR cable, then plug the XLR end into the master out (right/left) of the mixer and plug the TRS end into the 2i2. However, I would actually just consider investing in an 18i, then you could mix each channel separately into an independent recorded track and ultimately produce a much better recording.
Firstly, what you are basically wanting to do is connect the mixer to the interface and not the inverse. The scarlett 2i2 has two TRS input jacks inside the XLR input jacks (through the hole between the XLR jacks).
Now, just plug in the instruments into the input channels of the mixer, adjust the parameters, check your settings using a pair of HD headphones and then, using two 6.1mm connecting wires, connect the two (L - R) output channels of the mixer to the respective (L - R) TRS(1/4") input channels of the audiobox usb. The TRS output jacks of the mixer are on the back panel of the Live 2404. The two jacks are placed vertically with respect to each other with a label saying
OUTPUT above them.
Finally, connect the USB from the interface to your computer, manage your settings and record.