Updated June 1, 2021
Please be sure your firmware is updated on your StudioLive and that you are using the latest Universal Control:
The StudioLive Series III Console and Rack Mixers feature 64x64 USB and AVB I/O routing.
This does not allow for the StudioLives to mix 64 input channels simultaneously, but rather allows for the 32 channel StudioLives to have 64 USB/AVB Inputs (Returns) and 64 USB/AVB Outputs (Sends) to choose from.
The StudioLive 32, 24, 16, 32SC, 32SX, 32S, 32R, and 24R Series III are 32ch mixers, it is not possible to exceed 32 input channels for mixing at one time.
(The StudioLives do also feature AuxIn1, AuxIn2, and TapeIn/DigRet for an additional 3 stereo L/R inputs)
Please note: the StudioLive Series III 64S is the exception to this and does allow for 64 Input channels simultaneously. For more information regarding the channel counts between Series III mixers, please see the comparison chart- found here.
Default USB/AVB Send/Return channels are listed below- these can be adjusted from the "Digital Patching" menu of your StudioLive:
1-32 = Channel inputs
33/34 & 35/36 = Aux in L/R 1&2
37/38 = Tape In
39/40 = Main LR
41-56 = Flex Mixes
57-64 = These are unassigned by default (except on the 64S)