Re: [Denemo-devel] MIDI events for shortcuts

[Richard Shann]

On Thu, 2014-09-25 at 22:19 +0200, Andreas Schneider wrote:
> Thank you for your quick response. Unfortunately I only understand part
> of the scripts.
> 
> Do I need to extend the MIDI-shortcut::controller directive in
> denemo.scm in order to query for other MIDI CC messages? That is add
> code to check for other values of type?
You could do, but if you are going to want to capture NoteOn NoteOff
messages you would use d-GetMidi which captures any (4-byte) message.

> 
> I tried to write a script to just show MIDI events in a dialog, using
> pieces from the scripts you provided, but it didn't work. Probably I
> have misunderstood something. My try was
> (set! midi (d-GetMidi))
> (d-InfoDialog ( midi ))
> Do I have to attach the script somehow?

d-GetMidi returns a number - the four-byte MIDI message as a 32-bit
number - it is rather primitive, so you would need

(d-InfoDialog (number->string  (d-GetMidi)))

but there is a procedure "disp" inside denemo for just looking at
values:

(disp "midi got is " (d-GetMidi) "\n\n")

would print out on the console (once a MIDI signal was received).

> 
> If the above works, I can extend it to some shortcuts. For example, I
> want to use the trigger pads to set the note duration. To this end, I
> have to check MIDI channel and pitch, and call the built-in function
> (which I guess
to find out which command it is, use the Notes/Rests menu - find the
command you want then right click to get the command name, and put d- in
front of it to get the scheme procedure name.
>  to be (d-Append1) etc.). Do I also have to prevent the
> MIDI event to be further processed, so that no note is inserted in the
> score?
On the contrary if you want further processing you have to do something
(I think perhaps d-PutMidi)
> 
> How can I get MMC (MIDI Machine Control) events?

You will need to look up the documentation to find out what these are as
a sequence of bytes. I may have only intercepted 4-byte MIDI messages at
the moment, but that is easily alterable.

> 
> A very comfortable way would be to be able to assign MIDI events in the
> command center similar to PC keyboard shortcuts.

Well, as a first move, if you are going to work on this, I will extend
d-GetMidi to ask for the MIDI message is an easier to use form (a list
of bytes would be easy to do).

I didn't pursue this myself because it's not so clear to me that it is a
good way to go - you can have more than one usb pc-keyboard attached, so
you could have one specifically for entering the commands you want
mounted right over your MIDI-keyboard. The keys on a pc-keyboard are
better for this than the squashy piano keys of a controller. But I have
wondered about this myself. I don't do enough editing of music (as
opposed to sheer music-entry) to judge. (And I have only a very basic
controller).

Let me know if you need any help.

Richard