Well you could but you may want to send controller and/or polypressure info from the virus to your sequenser and then you have to change it. Actually come to think of it i think that the virus receives both sysex and controller/polypressure when set to controller/polypressure so you could just leave them as controller and polypresure. I only change mine to sysex when i want to upload pathes as a sysex dump (for backup or sharing)...