On Thu, Mar 16, 2017 at 5:18 PM, Will Godfrey <willgodfrey@musically.me.uk> wrote:

On Thu, 16 Mar 2017 08:52:56 -0700 (PDT)
Len Ovens <len@ovenwerks.net> wrote:

> On Thu, 16 Mar 2017, Ralf Mardorf wrote:
>
> > what exactly does the fader of Ardour's mixer for MIDI tracks control?
>
> It depends...
>
> It depends on where the fader is placed (or where the synth is placed).
> If the fader has only a midi stream to deal with, it controls velocity.
> The values shown are (looking at latest git) 0 to 2. This is gain. with
> the fader centred at 1 velocity in = velocity out. if the fader is at 1.5
> then velocity out will be velocity in * 1.5. (eg 64 in * 1.5 is 96 out).

That's incorrect.

The math for audio gain control and MIDI gain control are separate and different.

The fader controls whatever types of signals are presented to it. If there is audio, it will do audio gain control; if there is MIDI, it will alter the velocity values of MIDI note on messages; if both are present, it will do both.

It will never scale a MIDI note on velocity value to an illegal level.