v0.91
- 05/24/2019 
- start with audio muted
- user must enable audio, no autoplay
- required by new policy for web audio

v0.90
- 02/11/2016
- support cycle time zero => always on

v0.89
- 01/05/2016
- make duty plot editable
- add basic touch support
- improve audio for very short pulses

v0.88
- 12/11/2015
- add file menu
- add Threshold plot
- add Edit Config File
- add Paste into Config
- optimize refresh performance

v0.87
- 11/30/2015
- add Duty Cycle plot

v0.86
- 11/30/2015
- add crosshair
- add pageview counter
- tweak look & feel

v0.85
- 11/24/2015
- add Drag&Drop of config text
- add MS Edge as supported browser

v0.84
- 11/08/2015
- draw grid log2

v0.83
- 10/30/2015
- add logarithmic plot and interpolation

v0.82
- 10/29/2015
- add "save to file"
- add "Edit other Parameters"

v0.81
- 10/27/2015
- make layout responsive
- plot area resizes automatically

v0.80
- 10/22/2015
- new feature: plot is editable
- new feature: enter/display frequencies as piano keys

Supported browsers:
- Chrome
- Firefox
- Opera
- MS Edge
- IE 11 w/o Audio