Hope it works for you! I actually picked up a Proteus 2000 rack module recently. I wasn't aware of any sequencer - the only references I see to riffs in the manual, are the little audition demos it does for each preset. So it clearly can play sequences, but i don't know if they can be edited, or triggered? I dont think the 2000 has an arp either, so maybe this feature is not universal on all of these modules.
edit: i can kinda achieve something similar with "bpm" presets, which are tempo synced. No idea how much i can edit these though. Still pretty cool.
edit: i can kinda achieve something similar with "bpm" presets, which are tempo synced. No idea how much i can edit these though. Still pretty cool.