Audio/video tools to combine sequencer clips

I have been messing with Unreal Engines Sequencer and have a nice collection of scenes/clips that need to put put together. While a great tool for rendering animation the sound editing/tools are not the best. So I was hoping I could get some recommendations on audio/video editing apps

I notice cyberlink has the PowerDirector tools on sale for around $60, which includes the audio tool AudioDirector 7 as well.

Anyone have a good recommendation or find that its better just to do everything in UE4?