There has been some incorrect info posted in here on the 9 cap super....-pkh-'s posts are totally correct.

I will add that there is not a ppm soly nor a pcm soly version...and I know this was already stated, all 9 caps are selectable between ppm and pcm and will work on all your old fm receivers as well as new pcm receivers. You can have model 1 on ppm and model 2 through 18 on pcm without changing a thing . All you do is cycle the power switch once you have changed to the new model and that will switch the modulation from one to the other. This goes for the "P" or the "H" model. The synthesized module allows you to select any channel on the fly that tyou want as long as you use the correct channel in the RX. Thats the real beauty to this radio....I use PPM and PCM on different models, I have 5 different memory packs to hold all my models in (around 50) and if i purchase the 7 channel fasst 2.4 module that is a 2 second swap i can have 2.4 too! All this in one great radio package!
You can use from $19 dollar park fly gws rx's all the way up to the $170 Selectable PCM futaba receivers. with the standard 9 cap super and if you buy the 2.4 setup you will have the best of both worlds. You can even buy the Spektrum module and use Spektrum 2.4 rx's too!
Shayne