This applies to the Liquid Mix
Some DAWs, including Apple Logic, can deal with floating-point sample values greater than 0 dBFS. If the 'Clip at 0dBFS' option is turned off, then the Liquid Mix can deal with these floating-point sample values. At some time in the future, this feature will ensure compatibility with DAWs that are capable of dealing with sample values that refer to levels greater than 0 dBFS. For now, it's best to turn clip at 0 dBFS to 'ON' (e.g. ProTools use where fixed-point DSP is used).