When you read a tab, or written music, how can you tell when to use an upstroke or a downstroke for the chords? For example, when i strum how so you know if your meant to be using all downstrokes or all upstrokes? Or if i'm meant to use a mix of both upstrokes and downstrokes, how do i tell when to use a downstroke or upstroke? Is there something written in the music notation that is susposed to tell me?
Or am i susposed to figure that out myself? If i am then how do i figure out if the note is an upstroke or downstroke?