Originally Posted by Phagor
Off the top of my head, these are analog:
EHX Bass Micro Synth
Digitech Bass Synth Wah
The EHX and the Ibanez aren't synths at all really, they're both just a combo of octaves fuzzes and filters. The BSW is definitely digital, at least as far as the modes that have an actual oscillator in them. I don't know if the Mothership's oscillator is analog or digital, but the pitch tracking at least is definitely digital. There is no analog way of performing the "intelligent ring mod" that they advertise on that thing.
99% of synth pedals are either just glorified octavers, fuzzes and filters, or they have a digital pitch tracker. The only analog way I know of to track pitch is via a PLL (see Schumann PLL or Infanem Harmony Synth) or via oscillator sync (Moog Freqbox)
I personally don't try to get hung up on the analog vs digital thing. All synth pedals have pros and cons. I would just go on sound and the features you need.
This right here is the real answer.