hi
i dont verry like virtual dj for mk4
are there other (better) programs for mk4
( preferably for free)
and can you set other effects on your deck?
pleaaaas heeeelp meeee!!! 
If you want a good program you need to pay for it.
You can use the DJay program - only for Mac platforms.
You can use the Traktor software but for that you need a MIDI profile available here:
http://ts.hercules.com/eng/index.php?pg=view_files&gid=17&fid=62&pid=262&cid=5
You can also use the Cross DJ - but not the free version, as that one will not support MIDI devices.
You might want to check out the following document:
oooh tanx everybody your fantastic! 
Have a look at MixVibes. Been using MixVibes Cross for 3 years now. Have seen it develop into a very good piece of DJ software
I'm also a Mod on there forum 😉
http://www.mixvibes.com/content/products/cross-0
Timecode, HID, Midi and Keyboard control
http://www.mixvibes.com/content/products/crossdj
Midi and Keyboard control
