Recording source

Hi !
I use the DDJ 1000 with an external sound card. Is it possible to add in the Rekordbox the possibility to set certain input channels to make the recording? Currently, on the internal mixer mode, the record can only be made at the mainout (software output). Other DJ software can. Another problem is the low signal level when using the external sound card. The sound card is Antelope Zen Tour. The output level on DDJ 1000 is ok, the output level of the sound card with the software other than Rekorbox is ok, instead the rekordbox with Antelope is relatively low.