Ok I solved the problem. For those who have the same issue they can use these lines for inspiration, anyway I can help if it's needed.
Code:
${color grey}NTFS HDD ${color 115199} ${exec df -H|awk '/mnt/ {avail += $4; size += $2; used += $3} END {print int(avail*100/size)"%"" "used"GiB"" " "of" " "size"GiB"}'}
${color}${execbar exec df -H|awk '/mnt/ {avail += $4; size += $2} END {print int(avail*100/size)}'}
Now I can see all my NTFS partitions as a whole in conky, and if there are any sugestions about that audio spectrum analyzer pls don't be shy 8-)). Using the lines I've provided assuming you keep your NTFS partitions in /mnt folder you should end up with something like this