About... Tone Portamento Step
The tool TonePortaStep is used in conjunction with the music editor ProTracker. This tracker uses the effect command Tone Portamento which does a linear slide from one note to another. The argument for this command is called number of units and is given as a hex number. This value is added to or substracted of the source note period value.
To get the right number of units for a complete tone slide, this tool is a very comfortable aid.