Henni, If I understand you correctly, you need to play back the Tyros 5 styles using the Audya Engine.. right ?

You copy the Tyros 5 styles to the vArranger style folder. Select Audya as the MIDI OUT in the settings for the vArranger.
Remap the style and RH sounds if required to use the Audya sounds(VCE sounds etc.)

You may need to load the .ins file for Audya to list out and be able to select the Audya sounds.

vArranger works best with the SD-2 /SD1/ SD4/SD5/SD1000 soundset.
Audya has many sounds which are far better than the above SD series. The vArranger has a user friendly interface for Live and detailed use and can be quickly used to assign, save and recall settings.

vArranger is flexible in that it does support SF2, .ins files and even vsti instruments with options of having upto three MIDI OUTs possible per channel.

Perhaps Dan can help you more on this.

Regards,
Jez