With the mixer you CAN record two separate tracks at one time - with one input panned left and one input panned right - but that's it, you can't record any more than those two separate tracks at one time.
As to your volume issues, you definitely need to look at your gainstaging. You should be recording in the -18DBFS to -12DBFS range, mixing to no more than -9 to -6DBFS. Mastering takes the volume up to the near 0dB range. Don't convert files to MP3 (you lose a lot of digital info) until mastering is complete.
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Mike
My music: https://mikebirchmusic.bandcamp.com
2020 Taylor 324ceBE
2017 Taylor 114ce-N
2012 Taylor 310ce
2011 Fender CD140SCE
Ibanez 12 string a/e
73(?) Epiphone 6830E 6 string
72 Fender Telecaster
Epiphone Dot Studio
Epiphone LP Jr
Chinese Strat clone
Kala baritone ukulele
Seagull 'Merlin'
Washburn Mandolin
Luna 'tatoo' a/e ukulele
antique banjolin
Squire J bass
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