Who should I contact when I need technical support for GVIDO product? GVIDO MUSIC Customer Support July 05, 2020 14:50 Updated Please reference our Product Support FAQ. If this does not solve your issue, please contact our GVIDO Customer Support. Related articles Where can I locate the serial number? What is the Support Center's operating hours? How to modify the PDF page size/DPI: It doesn't operate properly. What should I do? Can I turn the page using another manufacturer's foot switch?