Most of these keys can be preceeded by a number, which usually means to apply the command that many times.
simple gdam123 key bindings
key : j,k
action : skip to next/prev song
key : nG
action : skip to nth song. G skips to last song,
key : h,l
action : seek back/forward a beat, or a second if bpm is unknown
key : [,]
action : seek back/forward a bar, or four seconds if bpm is unknown
key : ^
action : seeks to beginning of song
key : n|
action : skip to nth second
key : i
action : pause/unpause song
key : o,p
action : decreases/increases volume by delta%, default 10%
key : O,P
action : set volume to 0%, 100%
key : z
action : shuffle playlist
key : r
action : toggle repeat mode
key : n
action : repeat last search
key : N
action : repeat last search, in opposite direction
key : ^G (control-g)
action : print extended information about the current song. Info includes length, sampling rate, and id3 tags.
key : q
action : quit gdam123