I put this post earlier in the Public Space forum, but without any bites. So I thought I would post here in case there is more specialized interest.
I have used Lilypond up to now with the Frescobaldi GUI interface, but thought I would try out Musescore 2.2.1. Musescore is great, although Lilypond allows very small adjustments and corrections (usually to avoid note head clashes when the music is complex) not available in Musescore--but you have to know the find detail of how to do these tweaks which involves a steep learning curve for first use.
However, for those of you interested in a good, but free soundfont for classical guitar, I found RealFont_2.1.sf2 gives quite a good sound (and I have tried about a dozen options). You do have to use the treble_8 clef to ensure the pitch is correctly transposed down. RealFont_2.1.sf2 is certainly much better than the default soundfont in Musescore. I have used this soundfont in Lilypond up to now by using the CoolSoft VirtualMIDISynth playback interface. It is a simple matter to copy the soundfont into the "sound" folder in the Musescore directory. It is then available through the menu under 'view/synthesizer'.
Maybe others have found or can suggest even better soundfonts for classical guitar.
PS: Here is a link to an mp3 file exported from Musescore using the RealFont_2.1.sf2 soundfont: https://1drv.ms/u/s!AoU7IRQ6X9csoj3kdEq4Dk-l7_y2. Click on the link to play the file, or right click to download. It gives some idea of the sound. This is an adapted version of Españoleta by Gaspar Sanz (1778—1839) drawing from several sources. Musescore can't handle some features such as chord rolls.