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These functions are for finely adjusting loops, marked ranges and the zoomed area :

button	description
1	range mode - loop,mark,zoom,trace some actions automatically switching the mode : loop : switching loop on or off in the options mark : select a range with the mouse zoom : use hotkeys for zooming or use buttons of the zoom-toolbar
2	lock begin or end (will not be moven on subsequent edits)
3	move begin or end
4	move to the left border
5	move to left fast
6	move to left slowly
7	move to the next left zero-crossing
8	move to the next right zero-crossing
9	move to right slowly
10	move to right fast
11	move to the right border
12	move to the upper border
13	move upwards fast
14	move upwards slowly
15	move to the upper peak
16	move to the lower peak
17	move downwards slowly
18	move downwards fast
19	move to the lower border

The faccillity for seeking zero-crossings is excellently suitable for generating crackle-free loops. Just set the loop points manually first. Then play the sample. On every retrace you will quite likely hear a crack. Now activate "lock" (2) and click on "<0" (7) to adjust the start and on "0>" (8) to adjust the endpoint until the crack is minimal or even gone.

If you have choosen "trace" and activated a sample-window, you will see the value under the mouse-pointer in fields (8) and (9) of the statusbar. The sample-value will be show in field (10) and can even be changed there.