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Drag a song onto the Shoreline window, or choose File › Open. Shoreline listens to the whole song for a few seconds, then press Play (or Space) to hear the master. When you're happy, choose Export Master (⌘E).

Open the recording, then switch the toolbar to Voice. Pick the preset that fits (Podcast, Interview, Audiobook, Voiceover or Video Call) from the menu next to it.

Use the Original / Mastered switch above the light view, or press C. Both play at the same loudness, so you hear what changed rather than what got louder.

Drag the highlighted loop in the waveform at the bottom, or drag its edges to make it longer or shorter. Click anywhere in the waveform to jump there.

Select EQ, then double-click the graph to add a band and drag it. Or choose Draw and paint the curve you want (hold ⌥ to erase).

Double-click any slider or band, or press Reset at the top of a module. Everything can be undone with ⌘Z.

Yes. In General mode, select Vocals and move the level. Small moves sound the most natural.

Shoreline stops before the sound would get squashed and tells you how loud it can go. Try a little more Character or Soft clip in the Maximizer, or a gentler EQ in the lows.

Everything in Shoreline is free to use: mastering, both modes, every module and comparing with the original. A one-time purchase unlocks Export Master, so you can save finished files. There's no subscription.

Choose Export Master… (⌘E), then Restore Purchase on the sheet that appears. Make sure the Mac is signed in to the same Apple Account you bought it with.

WAV, AIFF, FLAC, MP3, AAC/M4A, ALAC and CAF, and the audio from most video files.

A 24-bit WAV at the original sample rate, ready for any streaming service, distributor or podcast host.

Recordings of an hour or more work fine but use more memory. If your Mac has 8 GB of memory, close other apps before working on very long files.