When you record into a new empty project, the first loop you record typically sets the project tempo. Sometimes, people want to record some audio without setting the project tempo. There are a few options for how to do this. The one that is right for you will depend on what you are trying to do. It is planned for the future to support this more directly.
Some things that you can do:
Record into a one-shot. Recording into a one-shot will not set the project tempo. You can record and trigger one-shots when there is no tempo set.
Add a Loopy Pro AU instance. Add a Loopy Pro AUv3 to your Loopy Pro standalone project and turn off host synchronization. You can record and play back loops in it without it setting the host project tempo. This is a good solution when you want to record some audio that does not need to be in time with the main project. For example, you might record an ambient background that has no tempo. You can easily set up bindings between the main project and the AU in order to control recording and playback without needing to open the AUv3 window.
Record a loop and reset the project tempo. You can even reset the tempo in an end record follow action. If you do this, you can set the project tempo by trimming this first loop. Note that loop clips (as opposed to one-shots) require that there be a project tempo to playback. So, if you reset the tempo, you won't be able to play the loops until you set the tempo. Trimming the recorded loop will set the tempo.