Personally, I prefer using the keyboards for tuning. Good ear training din. Kaso syempre hindi mo magagawa yun kung nasa gitna ka ng tugtugan at may bigla kang narinig na out of tune note... buti na lang may tuner with mute yung effects ko. What I'm just trying to say is that don't rule out visual tuners, kailangan din yan.
Lalo sa dati kong experience kasi yung guitar ko e may floyd rose kaso wala dating mga mga locking nut (thanks to Arie for this). So I HAD to tune on every other song... talk about frustrating. At nung time na yun, wala pa kong digital na tuner, so I had to play and adjust the strings depending on the note being played... annoying po grabe. Buti na lang di ako nasisita nung leader namin.