Bone foley is easy to overdo: the wrong transient can sound like celery, and a long gritty tail can mask dialogue. Use this guide to choose the right type (crack, snap, crunch), set perspective (close vs distant), and write prompts that produce a believable intensity for your exact on-screen action.
Choose the action: crack, snap, or crunch
Start with what the viewer sees. A quick joint pop should be short and bright, while a break-through moment needs multiple micro-cracks and heavier texture.
- For instant hits, prompt: sharp transient, short decay, minimal debris
- For messy breaks, prompt: micro-cracks, gritty crunch texture, slight low-end thump
- For controlled motion, prompt: creak then snap, moderate tail, clean background
Match camera distance and room tone
Perspective sells realism. Close sounds need detail and less space, while distant sounds need softer transients and more reflections.
- Close-up: close-mic, dry, low room tone, centered mono or narrow stereo
- Across a room: distant, softened transient, audible reflections, longer tail
- Outdoor feel: reduce reflections, keep tail shorter and airier
Control intensity without turning it into vegetables
Overly bright crunches can read like celery or carrots. Push realism by balancing pitch, debris, and masking strength.
- If it sounds too crunchy, prompt: cleaner crack, less debris, less high-end grit
- If it feels weak, prompt: heavier impact, low-end thump, slightly longer decay
- If it masks speech, prompt: shorter tail, lower midrange, tighter transient
Time it to the cut with the right duration
Pick a duration that matches the on-screen motion. Short clips are best for single-frame sync, while longer clips work for sequences and movement beds.
- 5 seconds: single crack, snap, or short pop cluster
- 10 seconds: multi-crack fracture sequence with natural gaps
- 20 seconds: skeleton movement underlay with consistent texture
