Eric,
That's an interesting glitch on the Technics... I'm curious why this particular glitch is on the 550. The PSR-540,550,640,740,1000, and 2000 don't have arppegiators....?? It's an interesting little bug. I wonder if there is some common chips that the PSR-550 shares with the DJX...??? Some of the styles on the 550 were taken from the DJX... This I do know..

Squeak
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.