Rogue Amoeba has issued SoundSource 5.0.3, a maintenance release for the recently upgraded audio control utility. The update returns the capability to adjust audio from menu-bar-only audio apps (such as Triode and Vox), ensures correct handling of audio from the Special Sources found in the Add Favorites menu (including Siri and Text to Speech), resolves a conflict that could occur when playing full-screen video, properly handles Sound Effects volumes when it’s applying a software volume adjustment, and makes many improvements to accessibility (including improved navigation when using VoiceOver).
SoundSource 5 is regularly priced at $39 but has an introductory price of $29 through the end of August. If you previously purchased SoundSource 4, you can upgrade to version 5 for $19. ($39 new with a 20% discount for TidBITS members, free update, 13.9 MB, release notes, macOS 10.12+)