Yes playing back the song everything sounds fine.
About saving disk space, in the case of the Virus, this is due to the hybrid purpose of the Virus: it is an hardware component, but the tracks are played as a normal VST, therefore, in addition to a less DAW CPU duty, no further disk space is required for the Virus tracks also. In othe words the Virus runs in Cubase like any other VST, with the only difference that the sounds are generated by the Virus DSP in realtime, so no audio clips are required.
After some test it seems that the issue appear while using some high DSP consuming patches.
So I think to solve the issue, the best approach is to test the mixdown from time to time and transferring in audio those tracks based on high DSP consuming patches.
Still remains the fact that rendering only the portion of the song that contains the malfunction, everything runs smoothly.
