I just got both of these pedal and have been experimenting. My first impressions are that the Octamizer is very, very flexible, I get a real thick Synth like sound or a real subtle voice with it. Tracking is awesome, even tracks the low B pretty reliably. The filter twin is very nice, I can get a bunch of different voices with it, it's almost got a vocal quality to it. Here's a quick demo I made, first few seconds is clean, no effects, the I added in the Filter Twin and finally the Octamizer.