Language learners: balance video, dictionary, and music apps on Mac

A language-study session runs three sound sources at once — immersion video, a dictionary or flashcard app firing short pronunciation clips, and quiet background music — and macOS gives them one shared volume. The fix is a per-app mixer: set the video to a comfortable level, push the dictionary and flashcard audio above it so you never miss a word, and park the music low behind everything, each app holding its own level no matter which one you touch next.

If you study a language on a Mac, you know the fiddle. You're watching a native-speaker video, you tab into Anki or a dictionary to check a word, and the pronunciation clip is so quiet next to the video that you replay it three times. So you turn the system volume up — and now the video is blasting. You add lo-fi in the background to stay in flow, and it either drowns the speech or you can't hear it at all. One master volume can't serve three jobs that each want a different level. This guide fixes that.

Why the levels never line up on their own

It isn't your ears. The three sources are mastered completely differently. Full-length immersion video — a YouTube lesson, a Netflix episode, a podcast interview — is mixed to sit at a steady, comfortable loudness. The short audio in a dictionary or spaced-repetition deck is a different animal: a one-second native-speaker recording, often quieter and with less dynamic range, dropped in from a crowd-sourced clip library. At a single master level tuned for the video, those word clips land soft and easy to miss — which is the exact opposite of what you want, because the pronunciation is the thing you're trying to burn in.

Background music is the third problem. You want it present enough to keep you in a study groove but never competing with speech. On one volume knob, the only way to lower the music is to lower the lesson with it. macOS has no per-app volume mixer — the volume keys and Sound settings move a single output for the whole machine — so there's no native way to say "video at 60%, dictionary at 100%, music at 20%." That's the gap.

The three-app study mix

Think of your session as three channels, each with a job. Here's the mix most learners land on, and why:

The point isn't the exact percentages — those depend on your room and your headphones. The point is that these four rows each want a different setting, and no combination of the system volume keys gets you there. You need per-app control.

The free way, and where it runs out

You can get partway there for nothing, because some of these apps carry their own volume. A browser tab can be muted, Spotify and Apple Music have internal sliders, VLC has its own level, and many players go past 100%. If your whole session is "YouTube lesson plus Spotify," lowering Spotify in Spotify might be all you need. For that specific pair, see controlling YouTube's volume independently on a Mac.

It breaks down the moment your setup gets real. Anki and most dictionary apps have no output slider at all — their playback is whatever the system hands them, so you can't boost the one thing you most need boosted. Every app that does have a slider puts it somewhere different, so mid-session you're hunting through windows and menu bars instead of studying. And nothing remembers the mix: quit, come back tomorrow, and you're rebuilding it from scratch. Manual juggling is fine for two apps once; it's friction you feel every session when you're doing focused work daily.

The real fix: a per-app volume mixer

A per-app mixer sits at the macOS audio layer and gives every running app its own level in one place — the control Apple never shipped. That's the only approach that works for apps with no slider of their own (your flashcard deck), and the only one that lets you set a study mix once and recall it. A few tools do this honestly, and they differ mostly in how you reach the controls:

All three set per-app levels. Background Music is free and open source and worth trying first if budget is the only question — it's a menu-bar list you open, find your app in, and drag. SoundSource is a polished, deep utility with per-app EQ on top of volume, which some learners like for making speech clearer; at $49 for version 6 it's the priciest of the three. Fader is built around getting to the control fast, for $19.99 one-time with a 3-day trial.

Why speed matters when you study

Studying isn't a set-and-forget mix. You raise the dictionary, drop it, pull the music down for a hard listening passage, bring it back. If every one of those changes means moving to the menu bar, clicking an icon, finding a row and dragging a slider, you'll stop bothering — and you'll go back to fighting one volume knob. That's the difference between owning a mixer and actually using it.

Fader's approach is to make the keyboard the mixer. You hit a toggle hotkey, the keys become faders — one letter column per app — and you ride the video, the dictionary, and the music without leaving the video or reaching for the mouse. Boost the flashcard clip for a tricky word, nudge the music down, all with your hands where they already are. You can also bind a per-app mute key, so silencing chat and alerts for a study block is a single keystroke. For the wider picture of what per-app control looks like on macOS, see how to control individual app volume on a Mac.

A setup that survives tomorrow's session

Once the mix feels right, the goal is to not rebuild it. With a per-app mixer your levels attach to each app, so the next time you open the video player, the deck, and the music, they come back where you left them. That turns "spend two minutes balancing everything" into "sit down and start." For a language learner grinding daily reps, removing that startup friction is most of the value — the tool disappears and the study stays.

Bottom line

Language study on a Mac is three sound sources at three different loudnesses, and macOS gives you one knob. For a one-off, an app's own slider is free and fine. For the real thing — loud lesson, louder dictionary, quiet music, muted pings, all held in place and recalled every session — you need a per-app mixer. If you want to ride those levels without ever leaving what you're reading, that's exactly what Fader is built to do.