How to Add Custom Sounds to SlapMac

What you need

Any MP3 or WAV files you want to use as slap sounds. The files can be any length — but short sounds (under 3 seconds) work better because they fire and finish before the next slap. Longer files will be cut off if cooldown expires.

Supported formats: MP3, WAV, M4A, AIFF. Put them in any folder on your Mac — the Desktop, Documents, wherever you like. SlapMac reads them directly; it doesn't copy files.

Step 1 — Organize your sound folder

Create a folder anywhere on your Mac — name it whatever you want (e.g., "My SlapMac Sounds"). Then choose one of two structures:

Simple (all events get the same pool): Drop all your audio files directly in the root of the folder. SlapMac will pick randomly from them for every event — slap, shake, charger connect, charger disconnect.

Per-event (recommended): Create subfolders named exactly:

• slap — sounds for slap/shake events
• connect — sounds for charger connected
• disconnect — sounds for charger disconnected
• lid — sounds for lid open (Lid Creak)

Put audio files in each subfolder. You don't need all four — only the subfolders that exist will be used. Empty subfolders fall back to the root pool.

Step 2 — Point SlapMac at the folder

1. Click the ✋ icon in your menu bar
2. Go to Settings
3. Click Custom Sound Pack
4. Click Choose Folder… and select your sound folder
5. Toggle Use Custom Pack on

SlapMac will immediately switch to your folder. Test it with a slap — you should hear one of your files.

Step 3 — Mix with built-in packs

You can run a built-in voice pack alongside a custom folder. SlapMac will randomly choose between the two pools. Toggle "Mix with built-in pack" in the Custom Sound Pack settings and select which built-in pack to mix with.

Tips for great custom sounds

Keep files short. 0.5–2 seconds is ideal. Anything over 4 seconds will feel slow if you're slap-testing repeatedly.

Normalize volume. All files in a folder should be at roughly the same loudness — otherwise some sounds feel quiet and others will blow out your speakers. Use an app like Permute or Audacity to batch-normalize to -3 dBFS.

Variety is key. Put at least 10+ files in the slap folder — with fewer files the repetition becomes obvious quickly.

Short, punchy sounds win. Movie quotes work well. Sound effects work better. The "thwack" of a cartoon punch lands harder than a 3-second monologue.

Switching back to a built-in pack

Toggle off "Use Custom Pack" in Settings. Your folder selection is remembered, so you can toggle back and forth without re-selecting the folder.