I’ve got my C4 working through the hub with midi perhaps I can help!
I saw in another post that you had your hub and C4 on Midi channel 2. The default is midi channel 1 on the hub and it is recommended to keep it on that in the neuro manual. So double check that and change it back to channel 1 in the desktop app if you want to. All the other source audio pedals use 1 as the default. Once the hub is updated to handle the C4 in scene saving you’ll want it on 1 with the rest of the SA stuff anyhow.
Rodger mentioned not having them on the same midi channel. I think this came up in the TGP thread because the hub blocks MIDI PC messages on its channel and doesn’t pass them on. However at this stage in the game the only way you need to change presets is with MIDI CC messages. So you don’t need to send midi PC messages like you said you were doing on channel 2. The hub will block them. I have both my hub and C4 on the same midi channel 1.
I am sending CC104 - 3 on midi channel 1 to engage preset 4, it works. Note that [On Data 1]=104 (the midi CC# we want to send in midi channel 1) and [On Data 2]=3 (the value of the midi CC we want to send to pick the preset, 0-127).
Also remember you’ll be one off from the preset number you actually want to engage. So if your favorite preset is 012 you’d have to send CC#104 011 to activate it.
Never used the one controller pedal - does it always send PC messages at the same time as CC? It could be sending the data incorrectly.