Bram Stoker's Dracula

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Music score	NO
Sound effects	YES
Multiple voices	YES

Although it has multiple voices, this doesn't feel like a radio drama, it's more like a reading with multiple voices, there's even some sound effects but not many, still it's good. Great story off course but somewhere the performance doesn't do it for me.

Macabre Mansion

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Music score	NO
Sound effects	YES
Multiple voices	YES

A group of enthusiast storytellers perform dark tales with a bizarre or supernatural twist that are sure to captivate your attention and leave you wanting more. Check their website http://www.macabremansion.com.

H.P. Lovecraft Complete Playlist

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Music score	NO
Sound effects	NO
Multiple voices	NO

The complete list off all H.P. Lovecraft tales I could find on Spotify in Chronological order. Let me know if I missed something. If there's multiple versions, the playlist contains the version I think is the best, here you can find their separate links:

Witchcraft Magic: An Adventure in Demonology

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Music score	NO
Sound effects	YES
Multiple voices	NO

Most saw Vincent Price as quaint, eccentric, or just plain odd, so when he produced a recording of “readings” entitled Witchcraft and Magic: An Adventure in Demonology, no one really took it too seriously. But we now know that Price was serious, having an affinity for not only his persona as Hollywood’s leading man of the macabre, but for the actual subject matter itself. Whether or not it was disregarded as just another performance of the role that gave him notoriety, the album included a track called “How to Communicate with the Spirits,” which amounted to nothing more than an advocating of necromancy.

H.P. Lovecraft in Symphony

The Stories of H.P. Lovecraft

While searching for "The Doom that Came to Sarnath" I stumbled upon "The Stories of H.P. Lovecraft - A Synphonic Collection". Though not an actual audio-book or play these tracks do tell stories. It's a nice collection and might be a good background for your own H.P. Lovecraft adventures or maybe while reading one of his stories.