Well I currently have a VMS4 and i want to recor my mixes…but for some reason inaudacity wont let me record after i turn on the vms4…so i have to put it on record on audacity and then turn on the vms4 and the thing is its recorded in a very low resolutionand i dont know why …the vms4 has an external sound card so that may be but i dont knoW!!
Audacity does not support MIDI controllers or any kind of MIDI input.
If you can speak good English, it is better to post to the main Forum in the board for your operating system and version of Audacity. 
Gale