hm, for volume normally(as an standard between VSTi) is CC7 and/or CC11. Normally CC11 will come before some effects like reverb and CC7 for all coming out.
You can send these messages using a MIDI controller, in a MIDI item, or using ReacontrolMIDI.
but you can also change the volume in reaper using the faders, automation, vst etc etc
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