For some reason, many VST apps don't take Midi CC codes above 90.
The Prophet 6 CC codes are nicely grouped in according to the instrument layout, but as a result, some really basic functions that you want to control in VSTs are having a CC number that is higher than 90.
Maybe in a software update the CC codes can be sorted by whether they are basic/essential or not.
For example. The ARP ON/OFF currently has a CC value of 58 (below 90), but it is not very usable when teaching VSTs... The LP filter cut off on the other hand has a CC value of 102, and this is a key function which many VSTs cannot read.