Beepster
The Gain label on MIDI tracks controlling velocity is indeed a little misleading and struck me as odd when first learning the program but aside from the label it is a perfectly functional and useful knob to have on a MIDI track. It takes the concept of Gain and gives it a MIDI equivelent as MIDI is merely data... not audio so velocity is the closest thing to controlling the input. It makes sense. There is NO GAIN IN MIDI!!! ONLY IN AUDIO!!! The audio tracks associated with a MIDI synth all have Gain knobs that control Gain because they are audio tracks.
Midi CC 7 is the continuous controller number in Midi for controlling MIDI Volume. There is a gain in midi!
Say you record a guitarist, and he loves the tone from playing with a certain strength,when you reduced the gain in the console, he would be not happy it you affected this tone just to deal with your gain staging.
So to record a Keyboard player and he is happy with his playing and dynamics, and you reduce the gain but being that it's not gain, it's velocity, the tone of the piano, rhodes, synth sound changes. He says 'it sounds quieter to me and a bit different', you reach for the console fader and play it a little higher in the mix, and he says 'it's louder now, but it sounds different?', but you are adamant all you have done is changed the gain, which of course you haven't.
This is a bit like changing the input to a guitar amp, than to a console, except we are dealing with a console.
As a previous poster said ion the thread, if this trims, what happens to the lowest velocities. A midi drummer would be asking 'where did my ghost notes go?'.
Simply re-naming the knob
'Velocity trim' would be accurate and save confusion. This has got to be the easiest bug fix to fix that exist hasn't it, just re-naming.