Re: [LMMS-devel] MIDI velocity handling

[Tres F. <tre...@gm...>]

For me, note volume is a very minor compatibility issue when migrating a
project to the new version, if that helps.  It's quick to fix volume via
knob or fx channel, so if there were any negative impacts to backwards
compatibility, I find volume to be relatively minor of one.  The largest
impact would be instruments that specifically stack FX processors that
change sounds dramatically depending on volume (i.e. Erazzor.xpf).

-Tres

- Tre...@gm...


On Wed, Feb 26, 2014 at 4:36 PM, Tobias Doerffel
<tob...@gm...>wrote:

> Hi,
>
> I'm about to deal with https://github.com/LMMS/lmms/issues/280 however
> we have a little problem here. Notes at volume 100% equal MIDI events
> with maximum velocity (127). For notes above 100% we can't map the
> volume properly to a MIDI velocity. This leads to problems in two
> areas: test notes in piano roll which are sent to the instrument track
> as MIDI events and MIDI-based instruments. In both cases we can't play
> notes louder than 100%. The question now is how to fix that. IMHO
> there are three possible solutions:
>
> - map volume 100% to MIDI velocity=63 and volume 200% to velocity 127.
> This would make no difference for the test notes as the MIDI velocity
> is mapped back to a volume with the same formula later. For MIDI-based
> instruments this would lead to sound at half the volume which could be
> normalized again in InstrumentTrack::processAudioBuffer() (v_scale is
> doubled if n == NULL). In terms of volume things would be the same as
> before except that we have a correct behaviour for notes with volume
> up to 200%. The only drawback here is that instruments may sound
> different at velocity=50% - imagine a good piano soundfont which would
> play a less bright sound.
>
> - make test note playback work at arbitrary volumes with a
> workaround/additional information and cap velocity at 127 for
> MIDI-based instruments. This would mean that any notes on e.g. an
> Sf2player or VST instrument track will have a maximum volume of 100%
> even if you set a higher value in piano roll.
>
> - remove support for setting a volume > 100% for notes in piano roll
> at all. Existing projects would load regularly so compatibility would
> be kept. This would be the cleanest solution.
>
> Any opinions?
>
> Toby
>
>
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