That will work, but why not save the int/aux/input on soundcard for somthing else since you had 2 scare up those funny audio cables?
Also, why add another slider 2 your soundmixer? If that is all U have I still suggest going CD/AIW/soundcard(CD/in) & keep it simple.
But what U suggest makes a lot of sense if your CD has a digital output. In that case, connect dig/CD/out to dig/CD/in on soundcard. Then connect CD/out on AIW to int/CD/in on soundcard, if you have a second CD(RW?) connect that to the CD/in on AIW. This also saves
int/aux/in on soundcard for something else...