for diferent animation modes like walk and idle ect. you should know on which frame is for example walk starting and on which frame is finishing. Then you use LOOP OBJECT command like this:
loop object 1,6,25
1=object number
6=starting frame
25=finishing frame
-in this example walk animation starts at frame 6 and finish at frame 25
I am not sure, but may be you have to use set -SET OBJECT FRAME 1,6- in front of loop comand. Since set object frame command is crashing my computer I am not sure about it.
For smooth transition between frames you use SET OBJECT FRAME with OBJECT INTERPOLATION command. As I sad, set obj. frame is not working for me for unknow reason so you have to find it out yourself, which is sure not so dificult if you read DB help and see examples given there.
Bye the way, DB help is made WERY good and most of the questions you may have are answered there. Just take time to read it.