Ah, thank you for your report! It has confirmed an issue I believe I have found a solution for. The issue with the violin minigame is the plugin uses your FPS as a timer. RPGM was made when monitors averaged 60hz. So anything above that just blasts through the timers. Yanfly has a plugin that deals with this issue and I am deploying it as we speak. An updated version shall be available after I have finished replying. A bard needs his instrument after all.
Also after you play your violin and study your new Encyclopedia, a pot should appear on your stove. Camilla will stop by to eat half your food. I look forward to hearing about your adventure from there!