You need to use an external reference pitch. That's what a tuner is for. This page has a video explaining the tuning process & the GT online tuner.
https://www.guitartricks.com/guitar-tuner
Hope that helps!
You need to use an external reference pitch. That's what a tuner is for. This page has a video explaining the tuning process & the GT online tuner.
https://www.guitartricks.com/guitar-tuner
Hope that helps!