I would suggest to try this plugin as a dry/wet module: https://pedalboards.moddevices.com/plugins/aHR0cDovL2dhcmV1cy5vcmcvb3NzL2x2Mi94ZmFkZQ==
The other plugins that you are mentioning are available on our system but or currently still in the BETA store. You can only see these plugins when you have “Show beta plugins in the store” enabled. It’s a box you can tick that is under “Advanced Settings -> User interface”. Once this is done, you can click at “Show BETA plugins” in the filter section in the plugin store.
In BETA we have the “mod-volume” and “mod-volume-2x2”, which works as a passive volume/attenuator knob. These plugins are already tested by us, and will be released to our regular store most likely by the end of this week or somewhere next week. But it’s already possible to download them from the BETA section.
There are also some mixers in the BETA section for 2 channels, 4 channels and 8 channels. I do have to note that, although I believe they work fine, these have not been tested properly yet and are currently lacking a GUI. One other downside is that they are part of a big pack of plugins, so if you would install the mixers it will also install a whole lot of other plugins.
We do have the mixers on our list of plugins that we wan’t to move to our regular store, but didn’t come to it yet.