"But afterwards the recorded track has a much lover volume level than the others"

Your explanation should give hime the help he needs.
Seems to be the signal actually getting recorded, and this *may* be because of volume adjustments while recording with the other tracks, so he can hear the other tracks while playing, or it may be the soundcard record properties are low while the line in playback properties are set higher..


I do not work here, but the benefits are still awesome
Make your sound your own!