Yeah, I hear you… I haven’t been able to find much with respect to bass demos either, but as I am mainly/only interested in the modulation pedal (Astra) and since most (all?) modulation pedals pretty much work on bass as they do on guitar, I am prepared to take a calculated risk. At the end of the day, even if they do something “weird” to your sound, maybe it is something you find interesting/pleasing!?! I guess it is often very personal if you like a certain pedal’s output…
There is a tiny little demo of the flanger in the Astra with bass in this video (at about the 6:50 mark) - hardly comprehensive by any stretch of that word, but at least a little teaser:
