Everyone recording his band in small project studios tends to mix and master the songs at once.
Leaving aside the fact that channel plugins, such as compressors, limiters or EQs, produce quite a bit of processor load, we should separate mixing & mastering steps.
For this the difference between mixing and mastering has to be clarified.
When mixing, the instruments recorded on separate trackes get a song adapted volume.
Who don't know the problem? You play the first song with fingerpicking, the next song with a plectrum and the last one is much louder. Therefore my clean patch had a compressor assigned to the CTRL pedal. But, there's a much better way without the CTRL pedal.