Vox-US-ONLINE Course

WhatCourse (online event) on voice range profiling and speech range profiling, including the software ‘Vox Phonetography’.
When1. July 20 + August 10 2022

2. September 7 + September 28 2022

3. October 26 + November 16 2022
WhoCertified SLPs with a specialization in voice disorders
Costs€670 (Receive €100 discount (+/- $110) when you register at least 3 weeks before the first course day as an early bird-discount!)

Vox Phonetography United States ONLINE is an essential course for US-based SLPs who work with voice and want to use voice and speech range profiling in their daily work.

Phonetography provides an objective, visual representation of voice capacities in pitch (f0) and loudness (IL). A phonetogram is of interest as a diagnostic and evaluative tool in the treatment of voice disorders. You can use it to determine physiological voice limits, measure the degree of voice disturbance and evaluate voice therapy on a functional level. You can also objectively measure the habitual speaking voice and the use of voice by means of the speech range profile. Vox Phonetography is a modern, cheap and scientifically based phonetography program. In this course you will learn to work with Vox most modern medium for making phonetograms. One Vox license is included in the course.

In these two course days you will get a theoretical basis of phonetography. You refresh the anatomy and physiology of voicing, you learn the purpose and recording protocol of the voice and speech range profiles and you understand the clinical value of phonetographic measurements. You make and interpret phonetograms yourself and fulfill essential and practical exercises before the second course day. The emphasis in the course is on disorders of the speaking voice, not the singing voice.

Course content

DAY 1 (9.00 am – 3.00 pm)

Start – login, check your video, audio en internet settings!
The sound chain – recording conditions, microphone and hardware
From sound to phonetogram – fundamental frequency and intensity level 
Relevance – the broader voice diagnostic context
Using Vox – configuration, menu navigation, settings and recording
Calibration – theory and practice
The speech range profile – theory and practice
The voice range profile – theory and practice
Recap, questions and explanation of exercises

DAY 2 (9.00 am – 2.00 pm)

Start – login, check your video, audio en internet settings!
The sound chain – signal to noise ratio, frequency weighting
From sound to phonetogram – the z-axis and voice quality measurements 
Accuracy and intersystem reliability
Beyond diagnostics – using Vox during voice therapy
Cases – interpretation and evaluation of the exercises
Recap, questions



Contact information


Time investment

The course will take place in two sessions, each on a Wednesday. The first course day takes place from 16.00 – 22.00 CET, being 9.00 am – 3.00 pm CST. The second course day takes place from 16.00 – 21.00 CET, being 9.00 am – 2.00 pm CST.

Upcoming dates (2022):

Practical information

All practical information and pre-course assignment materials will be send by e-mail to the participants.

(1) You receive your invoice + downloadlink for your Vox License within 24 hours after registration;
(2) You receive your downloadlink for all course documents + the Zoom link for the meeting a week before the first course day;
(3) You receive access to all video content of the course one day after each course day.


To learn about the theory behind phonetography, and directly apply it in practice.

The complete list of goals:

  1. The course participant understands the theoretical underpinnings of phonetography; 
  2. The course participant has sufficient knowledge with regards to acoustics, materials/hardware-, the sound chain and sound recording quality to make valid and reliable phonetography possible;
  3. The course participant knows and describes the physiological basis of vocal fundamental frequency and vocal intensity level;
  4. The course participant understands the significance of intensity level calibration and is competent in calibrating their own recording setup;
  5. The course participant is able to record a complete phonetogram in Vox Phonetography, both speech- and voice range profiles;
  6. The course participant knows and describes the diagnostic and evaluative value of phonetography in the broader context of care for people with dysphonia;
  7. The course participant interprets and compares phonetograms quantitatively (to norms and references) and qualitatively (in the context of pathophysiology, voice complaint, treatment choices and treatment evaluation).


Marthè Nijkamp, SLP and developer of Vox Phonetography.

Previous evaluations

“Marthè is a very passionate instructor instructor, I am very satisfied with the software”
– A. S., SLP

“The whole course is broken up into chapters, which makes it easy to follow and understand”
– V. v. H., SLP

“At our outpatient clinic we have worked with several phonetographs, right now we are only using Vox because it is so simple and straightforward to use. I cannot believe that Vox only costs a tenth of the other phonetograph”
– S. S., SLP

“Easily the best course of the year”
– S. C., SLP

“I’ve had a problem configuring Vox on my computer, I’m happy that Marthe could resolve it for me”
– Anonymous

“Thanks to Vox I can confidently make VRPs in my private practice, they provide a lot of information and singers are always happy to take a copy home with them!”
– Anonymous

Registration form


Financial – Marthè Nijkamp owns Nijkamp Voice and Speech Pathology (Heerlen, Netherlands) and receives royalty payments from the sale of the Vox Phonetography voice analysis product.
Course Content Disclosure – This course focuses solely on Praat software and the Vox Phonetography plugins for acoustic voice analyses of voice signals, and will not include information on other similar or related products that might be used for the same analyses.