Do two collaborators need to own same (extra optional) drum

[WillCornell]

a friend of mine and I are trying to collaborate. I layed down riffs and several soundlayers, and put this song on a disc, then mailed to my friend across country. He layed down a couple of bass soundlayers, and sent it back.
I noticed, however, that his result was missing the drum tracks I used for my original session. These tracks were those I bought extra from you all--they weren't part of the bundled drumtracks that come with Riffworks.
I think he may have to have bought these same tracks in order for his contribution to contain everything I sent him.
I've tried mixing down his session to a complete new song that has nothing but his soundlayer, then importing it into my finished session, but a warning comes up that this will eliminate all of MY soundlayers and replace with only his--not my goal.
Is there an easier way to do this?
Am I right in that he must have these particular tracks in his Riffworks file in order for us to collaborate this way?
--Will Cornell

[EvanBerard]

There's a way easier way to collab Will. Have you read this guide?

This way you can both work together at the same time from your own homes. No need to mail a CD. And you don't need to both own the same instant drummer sessions

EDIT: Scroll down to step 3 in the guide for collaboration!

Edit 2: Your friend also needs to have a RiffWorld account to be able to collab via rifflink! No need to mail CDs!

[cwight]

Evan is right but there is another way, if you want to continue working as you do. You can mix your drums down to a layer. Set up your drum pattern and mute any other layers you have recorded. Move a riff up onto the songline, and mix to riff. You'll have a new layer called bounce, which will just be the drums. I always then duplicate this layer and pan em (rename them drums as well). You'll need to do this for each riff though, so it's all a bit clunky. Rifflinking is the way to go, or just make sure you both buy the drum sets you are using...