The best alternatives to SoundSource are Boom 3D for Mac, Simplify for Mac, and Friend Mix. If these 3 options don't work for you, we've listed a few more alternatives below.
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The Best Audio Enhancer with 3D Surround Sound. Boom 3D is an all-new pro audio app that delivers rich and intense audio with 3D surround sound that makes any kind of headphone sound better! This premium version boasts of handcrafted Equalizer Presets, advanced Audio Effects and a toggle-friendly Intensity Slider that gives full control to the users for fine-tuning the audio as per their liking. Designed only for OS 10.10.3 and later, Boom 3D self-calibrates according to the type of Mac to offer a genuinely personalized experience to the users. The app has been fortified with an Application Level Volume Control, to adjust the audio volume level of the running applications individually. The app has a sleek interface with clean, minimal graphics that is easy to use. Boom 3D has a built-in Mini Audio Player with a simple drag and drop feature to add music effortlessly. In addition, with the help of an optional Audio Component, which works akin to the volume controls on your Mac, Boom 3D can effortlessly enhance your systems audio with Equalizers and Audio effects, for a crisper, clearer and much better sounding experience. Note: Boom 3D may not work when AirPlay and FaceTime are enabled or running on your Mac.
Friend Mix lets you build group playlists based on your friends favourite genres and artists. Create new users, add them to your mix and create a playlist tailored to your tastes. Discover which of your friends profiles were used to pick the tracks in the playlist.
NepTunes is a desktop accessory that allows you to see and control your music (Apple Music, Spotify) with customizable shortcuts, built-in scrobbler for Last.fm, and beautiful widgets.
The Synthstrom Deluge is a hardware sequencer that supports audio files, but (as with any hardware) it can be awkward to upload audio stems created in a DAW. This tool makes it easy to organise and upload projects to the device's SD card.