[gmpi] Re: 3.15 MIDI (goals.undo vs. playing)
- From: Tim Hockin <thockin@xxxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Fri, 18 Jun 2004 18:22:54 -0700
On Fri, Jun 18, 2004 at 03:50:06PM -0700, Chris Grigg wrote:
> First question is, undo what events? Reset the wiggled parameter to
> its state before... well, before what? Most recent parameter change?
Gesture! It is probably safe to assume some hysteresis on MIDI messages
within which they are part of the same gesture.
receive_MIDI
idx = some_hash_of_the_MIDI_message; /* for example CC# */
g = gestures[idx];
if g != 0 and g is_not_too_old
this message is part of the gesture g
else
gestures[idx] = a_new_gesture
> Well, undo on program change is probably unambiguous, but the
> continuous-gesture-oriented questions I asked above also apply to
> other messages you're more likely to find in performance input
> (pitchbend and the aftertouches).
So, the pseudo-code is simple, but if there is something braindead about
it, I trust you to find it :)
> More centrally, second question is: What is the meaning of an undo
> operation on messages that don't so much set a parameter as trigger a
> process, e.g. Note On? Just sending the corresponding Note Off does
> Bonus question: What is the meaning of an undo operation on a SysEx message?
Undo does not make sense for Note control, and it's dubious whether Undo
for Sysex makes sense.
> Just to be clear: Editing a patch via (G)UI is different from playing
> the instrument (though obviously there's some overlap), and undo
> certainly should apply for patch edits, I'm just asking about playing
> the instrument.
For many of us bedroom techno dorks, it is much the same. I use a MIDI
knob box to tweak a patch so that I can close my eyes and tweak. I'm
doing what a better sound-designer might do with the mouse.
Load a patch that is close to something I want
set up a MIDI map to my knob box
turn off the screen
tweak
Sometimes I have something I like, but then screw it up. An undo history
is INVALUABLE.
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