Yes that sounds like the kind of random thing that is happening, sometimes the arp will change direction and range as well as change octave, tone, cutoff, volume (from attenuator knob I guess), etc. So yes that sounds like the same sort of issue.

I sent an email to Murray earlier and he said he thinks it might be a bug and will try to replicate and see.

Thanks for the reply, and its actually good to know it sounds like just a software issue, rather than something else wrong with the Polysix hardware, which I thought was some kind of intermittent hardware issue, which can be trickier to find. :)

Will let you know when I hear any more info, but if you suspect your problem may be the same sort of thing, it might be worth sending Murray a bug report as well.

Thanks again

Tim