Hi, I continued doing tests.
On presets 1 to 4, I have PCs 1 to 4. On the IA page, I setup CCs to individual features, e.g. Gain Boost, Master Volume Boost, Delay, Tap Tempo.
However, after midi channel setup of the amp, either...
1) PCs work but not CCs
2) CCs work but PCs not, or very...