Fade audio in Adobe Animate

Hello!

I am attempting to fade my audio (played throughout my animation) at the end.

I am using the Fade Out function within the Sound pane of Adobe Animate CC. It works correctly, but then fades out too quickly at the end. I have just a little dead air at the very end of the animation. My solution was to use the "edit sound envelope" feature. I have managed this, but now the sound does not fade out evenly enough. In other words, the sound does fade off, but ends too abrubtly now.

I went from sound fading off to silence too soon, to sound fading nicely, but ending too abruptly at the end. Anyone know any tricks tro help with this?

Thanks,

Matt