I owned the Prophet 12 for a while but decided to sell it after hearing the Analog Four. I just couldn’t fall in love with the filters, destortion and digital sound of the Prophet 12 compared to the much warmer, richer and powerful sound of the A4. I finally purchased the Analog Keys and haven’t regretted it. I know that the Pro2 has different filters than the P12, but the main problem is that the oscillators are digital, compared to the analogue oscillators in the A4 and AK. Only your ears can tell you, but please spend some time with the AK and see if magic happens! I also have to mention that the bass or bottom of the A4 and AK is so much beeter than the Prophet 12 and (I have read from reviews) the Pro2. By the way, the bottom of the Analog Rytm is more powerful than any synth or groovebox I have ever heard!