WarmLine → Sales demo call audio
Sales
Demo-call audio: the loudest hour of your laptop's week
A product demo is the one call where your machine does everything at once — video, screen share, the product itself, and your noise suppression. Here's how to keep your voice clean while all of it runs.
Demo calls have worse audio than ordinary client calls for a mechanical reason: screen sharing plus a running product plus video plus suppression is the heaviest load your laptop carries all week, and a loaded laptop spins its fans — a noise source sitting closer to your microphone than anything else in the room. Demo audio prep is therefore mostly load management, done before the call, plus the same level-and-floor discipline as any client call.
This page covers the demo-specific failure modes. The general setup — the four signals, the fifteen-minute build — lives in the main guide to sounding professional on client calls; do that once first.
Why demos betray good setups
Reps who sound crisp on discovery calls get muddy on demos, and it isn't nerves. Three things change the moment you hit "share":
- The fan comes up. Encoding a shared screen is real work. Add your product in a dev or staging environment, a browser full of tabs, and video, and the machine warms until the fan is a steady hiss under every sentence. Suppression can remove much of it — but the better move is to not start the hiss.
- You move away from the mic. Demo posture is different: you lean into the screen, point at things, turn to a second monitor. Your capture distance drifts sentence to sentence, so your level does too — the client hears you approaching and receding like weather. No filter fixes distance drift; only awareness does.
- Narration collides with clicking. Keyboard and trackpad sounds sit millimeters from a laptop's built-in mic. On a quiet call they're occasional; in a demo they're your constant accompaniment. Suppression tools are genuinely good at keystroke sounds — this is one of the places a dedicated layer earns its keep.
The demo-day load ladder
Thirty minutes before the demo, work down this ladder. The goal is simple: the only things running are the call, the product, and your suppression layer.
T-minus 30 — reduce the load
- Restart the machine. One clean boot clears the week's accumulated background processes — the cheapest cooling upgrade available and it costs ninety seconds.
- Quit everything not in the demo. Not minimized — quit. Sync clients, update checkers, secondary browsers, chat apps you're not presenting in. Each one is heat, and heat is hiss.
- Stage the product in its lightest form. If a recorded environment or a lighter staging instance demos as well as the heavyweight one, use it. Nobody has closed a deal on the vigor of their local dev server's compile step.
- Pre-open every tab and view you'll show. Loading pages mid-demo is both a load spike and dead air — the two enemies at once.
- Suppression on, built-in filter down. One layer, per the pre-call checklist. Keystroke removal matters more on demos than on any other call type.
- Run the ten-second record-and-listen with the screen share already running — test the call you're actually about to take, fan load included.
Every slip is named on this page; the ladder’s goal is the right-hand stack.
During the demo: three behaviors
Anchor your position. Pick your talking posture — a consistent distance from the machine — and return to it for every sentence that matters. Point with the cursor, not your torso. If you use a second monitor, keep the call (and your voice's aim) on the laptop side.
Narrate through the clicks, don't compete with them. Pause your speech for the two seconds of heavy typing rather than talking over your own keystrokes; suppression removes most of the sound, but your rhythm sells calm either way. Silence while you type reads as confidence. Talking over clatter reads as rush.
Keep the composure line loaded. If noise strikes mid-demo — someone's doorbell, your own fan surging on a heavy screen — one calm acknowledgment and onward. The word-for-word scripts are in the noise-mid-pitch playbook; the demo-specific note is that your audience is often three people, not one, and composure impresses committees even harder than individuals.
The stakes math
A demo is rarely a first touch — by demo day there's pipeline value attached with your name on it. Against that number, the cost of demo-day audio diligence is thirty minutes of prep and, if your environment is loud, a suppression subscription: Krisp's Core plan was $8/user/month billed annually ($16 monthly) with a 7-day trial when we read krisp.ai on 2026-09-20. Weigh it against one muddy demo replayed to a buying committee — because demos, more than any other call, get recorded and replayed to people who weren't there. What the recording platforms do (and don't do) about your noise is its own page: conversation intelligence and your audio.
Line check
Demos stack the deck against your audio: max load, max keystrokes, max stakes. A dedicated suppression layer is built for exactly this call.
Referral tag on this button: start a Krisp subscription from it and Krisp pays WarmLine a fee. Your price is Krisp’s ordinary price, nothing added. The load ladder above costs nothing and does much of the job on its own; start there.
Demo-audio questions
Doesn't the suppression tool itself add load?
Yes — a real, honest trade. A suppression layer costs some CPU to save you from noise. That's why the ladder starts by removing load, not adding tools: on a lightened machine the suppression overhead is irrelevant; on an overloaded one it can be the surge that tips the fan. Lighten first, then filter.
Should I mute while the prospect talks during a demo?
In a one-on-one demo, no — muting kills the conversational back-channel ("mm-hm", "right") that makes a demo a dialogue instead of a screencast. With four-plus attendees, brief muting during their long turns is fine manners. Either way, a working suppression layer makes the question mostly moot: that's its job.
What about demoing from the office instead of home?
Open-plan offices trade your dog for forty colleagues; the floor is different, not better. The ladder is identical, and the suppression layer earns its keep on the coworking sales floor more than almost anywhere else.
Before the demo there was a discovery call — the listening-side prep is different, and it's here: discovery-call audio. And the deal after the demo is won on follow-up call habits.