I just loaded up the MGX file.
It is easy to reproduce the problem. When looping 2:nd time around the melody track becomes silent, but the green light indicator on the track view shows that it plays audio, but there is no sound.
I have as default the MS GS Wavetable Synt selected.
If I switch and tick in "use VSTi/DXi synt" then the sound comes back (I don't know at all what happens).

Edit:
When I have the VSTi/DXi synt selected it stays on when looping. If I deselect the VSTi/DXi synt then the sound disappears 2nd time around.


BIAB 2025, Studio One 7 Pro, Song Master Pro, Win11 Home. i7-9700K CPU, 32GB, ESI MAYA44eX, Guitar Pro 8, Transcribe, (EZKeys2, EZD3, SD3, EZBass, EZMix3)
Amateur: fiddle, guitar, vocal, beginner on bass.