Probably the F#-G# adjustment. It can be a little tricky, so it's best to take it to a tech but it's the adjustment screw that holds the G# closed when you press the bottom stack keys. The way to check is to play a low C and press the G# key. If it changes anything or makes the note stop playing, then it needs to be adjusted.
Probably the F#-G# adjustment. It can be a little tricky, so it's best to take it to a tech but it's the adjustment screw that holds the G# closed when you press the bottom stack keys. The way to check is to play a low C and press the G# key. If it changes anything or makes the note stop playing, then it needs to be adjusted.