Professional Background
Over a decade as a sound director and audio engineer, supporting artists and events throughout Germany. Based in Cologne, I design systems and lead teams that make artists feel safe and comfortable on stage.
Sound Direction That Creates Trust
Live sound engineering · Podcast production · Digital tools for audio pros
· Concert Sound · Podcast Production · Song Mixing · Live Recording · Web Design · AI Consulting ·
Trusted by musicians and creators across Germany
10+ Years Experience
DiGiCo · Yamaha · Allen & Heath ·
Midas
Physical + Digital Products
Experience That Delivers Results
Calm authority. Warm expertise. Based in Cologne.
Philosophy
Sound is trust. My job is to create a space where artists can focus on expression, not logistics—calm communication, reliable preparation, and empathetic direction.
Technical Expertise
$ own-gear: DiGiCo S21 · 32-ch Stagebox · Radial DIs · sE Mics $ consoles: Yamaha CL/QL · A&H SQ · Midas X32/M32 $ wireless: Sennheiser EW G3/G4 · Shure QLXD · ULX-D $ tools: Reaper · Ableton Live · Dante · Live Professor · OSM · Loopback $ roles: FOH · Monitor · System-Design · RF-Coordination
Comprehensive Audio & Digital Solutions
Audio Engineering
Concert Sound Direction
From advance to encore - system planning, stage management, and FOH/monitor workflows that keep artists confident.
Podcast Production
Editorial guidance, clean capture, and post-production that supports your story without artifacts.
Song Mixing & Production
Tasteful mixes that translate - musical decisions, modern tools, and honest revisions.
Live Recording
Discreet multi-track capture and backups designed for minimal disruption and maximum safety.
Digital Services
Web Design
Fast, accessible websites for artists and events - built with clarity and maintainability in mind.
SEO Optimization
Structure, metadata, and content strategy - so your audience actually finds you.
AI Implementation
Workflows and tools that save time - transcription, edits, asset management with auditability.
Digital Productivity
Templates, automations, and training - so your creative time stays creative.
— Browser Tools for Audio Engineers
A Platform of Tools You Can Open in a Tab
Browser-native apps for FOH, monitors, and studio — no install, no app store. Free tools work the moment you sign up; premium tools unlock with a one-time Gumroad key.
Show Clock
Full-screen stage timer for FOH and backstage — wall-clock / count-up / countdown, per-slot programs, 3 s realtime share to your crew's phones, Web Push, and PWA offline install.
timer
3 s share
PWA
BPM Tapper
Tap a beat to detect tempo, with a metronome, instrument tuner, per-song setlist manager, and a delay calculator. The first app live on the platform.
tempo
tuner
setlists
RF Coordination
Wireless frequency coordination for DE / UK / US / EU. Visualises TV-channel occupancy and finds safe wireless-mic windows with an SDR-style spectrum view.
wireless
DE/UK/US/EU
spectrum
Venue Acoustic Calculator
SPL, LUFS, room-modes, EQ-delay, and psychoacoustics reference in one tool. Save venue profiles, switch on stage, export to JSON for the next gig.
venue
SPL/LUFS
profiles
Frequency & Pitch Reference
Hz ↔ note converter with cents meter, harmonic series, audible reference tones, and a full equal-temperament table. Selectable A4 (432–444 Hz).
pitch
cents
ref tones
Click Builder for Song
Load a song, set tempo + offset, pick a click sound, and export a stereo WAV — song on Left, click on Right. Browser-only; the file never leaves your machine.
click track
tap tempo
L/R WAV
Setlist Generator
Build and share setlists with timing, notes, and changeovers. Export performed-songs reports for GEMA and other performance-rights agencies.
setlist
share link
GEMA export
Stage Plot Generator
Professional stage plots and input lists, export-ready for production crews and venues.
stage plot
input list
Spektra (SDR Plugin)
Real-time RF spectrum scanning via RTL-SDR dongle, with equipment library and intermodulation analysis. Ships as a platform tool or an embeddable addon.js from one license.
SDR
embeddable
spectrum
Six free tools, three premium — all in your browser. From Squaresmile Media, for audio engineers.
Open the platform →
Open the platform →
— Products & Downloads
Tools Built for the Stage
Practical tools made by a working sound engineer - not a marketer. Designed to save you time when time is the one thing you don't have.
Audio Plugin
SubPress
High-End Low-Band Dynamic Processor
€19+
A specialized compressor that processes only your low frequencies — split at a variable 40–400 Hz crossover, compress the low band, then recombine with phase precision. Tube-style high-band saturation and a Mono Low mode for club systems and vinyl. Zero latency, VST3/AU.
VST3 / AUMultibandMono LowInstant download
Get it on Gumroad →
Physical Edition
Check: One, Two
The Audio Engineer's Field Notebook
From €14,90
A purpose-built notebook for live sound engineers. Input lists, stage plots, monitor mixes, troubleshooting pages — everything you need, nothing you don't.
Lays flatQuality paperTouring-ready
Buy on Amazon →
Digital Edition
Check: One, Two
Printable PDF + Digital Planner
€7,00
Print as many pages as you need, or use with GoodNotes, Notability, or any PDF app on your tablet. Instant download after purchase.
Instant downloadPrint
unlimitedTablet-ready
Download on Gumroad →
Digital Edition
The Perfect Tech Rider
Printable PDF + Digital Planner
€19,00
Stop the Soundcheck Stress – Professionalize Your Live Production. A poorly written tech rider leads to technical issues, wrong gear, and frustrated crew. Based on the analysis of over 80 international riders
Instant downloadPrint
unlimitedTablet-ready
Download on Gumroad →
Digital Edition
Music Tour Budget Calculator
Printable PDF + Digital Planner
€15,00
Know your numbers before you hit the road.
Stop guessing whether your tour is profitable. This professional Excel spreadsheet gives musicians, band managers, and tour managers a complete financial overview of every show — automatically.
Excel-SpreadsheetInstant downloadPrint unlimitedTablet-ready
Download on Gumroad →
Digital Edition
Professional Hospitality Rider Template
Printable PDF + Digital Planner
€14,00
A professional hospitality rider protects your comfort, your crew, and your performance — before you even arrive at the venue. This template gives you everything you need to communicate your requirements clearly, contractually, and without leaving anything to chance.
Instant downloadPrint
unlimitedTablet-ready
Download on Gumroad →
Coming Soon
More Tools in the Works
Stage plot templates, input list sheets, soundcheck checklists — more digital tools for audio engineers are on the way.
Follow on Gumroad for Updates →
All products are made from real field experience — tested at live shows, not designed in a vacuum.
Visit the full shop at squaresmile.gumroad.com →
— Listen
Audio Samples
Selected sound examples embedded from Spotify, SoundCloud, or played locally. Each sample includes a short context.
Spotify
Live Mix - Ralph de Jongh
A front-of-house board mix captured during a mid-size club show. Focus: vocal
clarity and balanced low end.
Spotify
Podcast - Breaking the Frame
Photography and culture podcast hosted by Miss Souls — mixed, mastered, and
audio-branded from the ground up.
— Selected Work
Things I've Built
A mix of product design, custom tooling, and web work - each one solving a real problem for real people.
Product Design · Self-published
Check: One, Two — The Notebook
Conceived, designed, and published a physical and digital notebook for live sound engineers. From the page templates to the cover design - built entirely from my own on-the-job experience.
ProductPrint
DesignGumroadAmazon
View on checkonetwo.info →
Eventkalender
Tooling · Airtable · Built for Freelancers
Freelance OS
One template. Everything you need to run your freelance life like a professional. Freelance OS tracks your confirmed and tentative bookings side by side, gives you a live overview of your income, and makes your availability instantly clear - to you and to anyone who asks. Built by a working freelancer for the reality of freelance work: last-minute bookings, shifting options, and the constant mental overhead of knowing where you stand. Import it once. Stop guessing.
AirtableWorkflow
DesignAutomationSaaS
Available as a managed setup for freelance crews and event companies. Enquire via contact.
Get in touch to learn more →Eventkalender
Tooling · Airtable · Built for Venues
Event Desk
Stop managing your events in Excel spreadsheets and scattered WhatsApp threads. Eventkalender Pro is a ready-to-use Airtable template built from real experience running multi-venue event operations in Cologne. Import it in minutes, add your team, and have a professional booking calendar running the same day. Track every event, every technician, every status - all in one place, always up to date.
AirtableWorkflow
DesignAutomationSaaS
Available as a managed setup for freelance crews and event companies. Enquire via contact.
Get in touch to learn more →
Web Design · DNS · Email Setup
JP Touring GmbH
Web and digital setup for a Cologne-based live entertainment and tour production company. JP Touring works with artists including Bausa, reezy, and Tream on full-scale tour productions across Germany.
Web DesignTour ProductionCologneLive Entertainment
Visit jptouring.de →
Podcast Production · Audio Logo · Loudness
Mastering
Breaking the Frame
Breaking The Frame is a Cologne-based photography and culture podcast hosted by Miss Souls - a queer female voice covering a community that rarely gets to speak for itself. Behind the scenes, the show runs on a production setup I helped build from the ground up: mic recommendations, file system, edit workflow, and a mix process designed for the reality of indie podcasting. That means cleaning up guest audio from WhatsApp and Zoom, leveling every voice to a consistent dynamic, and mastering to platform loudness targets so listeners never reach for the volume knob. The audio logo — the sound identity of the show — was composed and produced entirely in-house.
MixingSound DesignPodcastStreaming
Visit Breaking The Frame →
Have a project that needs building? Let's talk.
Get in touch →
Get in touch →
Made by a working sound engineer — not a marketer.Check: One, Two
The Audio Engineer's Field Notebook
Built for the stage. Designed for your workflow. Input lists, stage plots, monitor mixes—and pages that lay flat when you're under pressure.
Input lists & stage plots- Monitor mix pages
- Troubleshooting notes
- Lays flat — designed for busy setups
- Physical + Digital editions available
📖 Buy Physical on Amazon
⬇ Download Digital on Gumroad
🌐 Visit checkonetwo.info
Let's Create Something Exceptional Together
For urgent inquiries, include your phone number and preferred contact time.
