When I record my music has lost its bass its sounds tinny and flat any ideas

Yes, possibly, quite a lot in fact. But none of them may be relevant to you since we currently know nothing at all about your computer and Operating System, your audio settings, your audio interface (if any), how you are listening to your music, even the exact version of the program you are using!

Please read this post and give us ALL the relevant information that is requested there. Especially details about your computer and what you are wanting to do and how, exactly, you are going about it.

With that information we may be able to suggest solutions to you; without it, no chance!

Jeff