It looks like that TuxGuitar fails to set the proper clef.
Just find the music in the lilypond file and put \clef "G_8" in front of it. That will do the trick.
Explanation: As Tom_C correctly points out, guitar is written in treble clef but one octave higher than it actually sounds. TuxGuitar apparently just sets a treble clef (or no clef at all, ...
Understanding standard tuning
Standard tuning is :
First you have to understand how note (or pitch I should say) notation work. The letter indicate the note name, the number indicates the number of the octave. Hence, A4 is an octave higher than A3. As a reference, remember the standard tuning absolute notes, or at least that the lower ...
There are some knobs in the instrument settings. The first one controls the volume:
I added the red arrow, which points to the knob that controls the volume. Note that this setting affects the volume of an instrument. If several tracks are associated with the same instrument, this knob controls the volume of all of them. So this is not quite the same as ...
Caveat: I have not used TuxGuitar, I use Guitar Pro and think it's well worth the money. That said:
The TuxGuitar Documentation page on sound has a couple points that may or may not help with your issue:
First, and more likely to be the issue:
Beside MIDI Port sound options in the Tools→Settings→Sound tab is also MIDI Sequencer options. In ...
Print formatting appears to be unsupported. Wayne Gabree's tutorial makes no mention of it, a question similar to yours received no answers, and a related bug report also suggests there is no such support.
From the bug report:
Luis - 2018-07-28: Style.stringSpacing works very well for the screen but not for printing the tab. Could you help me in discovering ...