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The Main differences are as follows; 

The Mini runs from USB Bus power rather than a separate power supply.
The Mini uses slightly different algorithms for EQ, Compression and noise Gate. This means that if you create a profile on the Main GoXLR and transfer to the Mini, you will need to adjust some settings. 
The Main XLR has an FX processor for Reverb, Delay, Pitch Shift and Gender effects. The Mini does not have access to these. 

In Terms of integrating the devices into your setup both devices will be setup in the same way. Please refer to our YouTube channel or Discord server for more information on setting up your device;

The Mini runs from USB Bus power rather than a separate power supply.
The Mini uses slightly different algorithms for EQ, Compression and noise Gate. This means that if you create a profile on the Main GoXLR and transfer to the Mini, you will need to adjust some settings. 
The Main XLR has an FX processor for Reverb, Delay, Pitch Shift and Gender effects. The Mini does not have access to these.