Hi I tried out the test of the bug and it affects mine also. I have to say though that you no one would go 3 octaves below becasue you can't hear anything good! BTW you don't need to actually set the arppegiator to -3 octaves, all you do is set the Arppegio to Glissando, and press the -OCT button 3 times and press low C and it will crash. There simply is no point to having a firmwave upgrade system because most people have probaly never encountered it and of course its something most people would not do! Play an arrpegio in low low C. Playing at that is inaudiable!!! Enjoy the XP-30 for what it is, I have and its the most useful and best Synth I have used.