Hi Mannas,
If I read your post correctly, you want to sync your Roland MV-8000 music production workstation to play nice with your Reason software.
Maybe you want to be on the lookout for Innerclock System's SyncLock.
Innerclock Systems - Precision Din Sync and Midi Clock Conversion, Synchronisation and Delay
I don't own one, but from what I understand it will change the audio coming from some spare outs on your sound card into a usable Midi Clock, Din Sync and/or Voltage signal. Might be worth checking out.