Try this:
Part 1:
First go into “Project Settings” by clicking on the settings button at the top of the Viewport and selecting “Project Settings”.
Find and click on “Audio” which is found within the sidebar under the heading “Engine”.
Ensure that “Allow Virtualised Sounds” has a check in its checkbox.
Exit Project settings.
Part 2:
Now open up each Soundwave/music that you are using in your scene from the content browser and search for a heading named “Sound”.
Under the ‘Sound’ heading, you should see an option named “Virtualise when silent”.Click its checkbox to put a tick in it and then exit the Sounds properties.
Now, create sound cues for the music you want played in the crypt and outside by right clicking on the relevant soundwave files in the content browser and selecting 'create cue".
Drag and drop the sound cue for the crypt inside the crypt and do the same for the outside.
Override their attenuation settings and adjust their inner radius so that they barely touch each other.
Then finally set their fallout distance values to zero.