Digital Audio Workstation (DAW) for people who want to record, edit, mix and master audio and MIDI projects. When you need complete control over your tools, when the limitations of other designs get in the way, when you plan to spend hours or days working on a session, Ardour is there to make things work the way you want them to.
In Linux there are already much better options than Ardour that I highly suggest to try:
These are not hobbyist products, we are talking about professional level software here, so they are both paid.
In any case REAPER is usable for free if you don’t use it commercially and it’s so cheap for the value it brings that there are no excuses in not buying it.