[LAU] Touchpad to MIDI

Matt Wright matt at ccrma.Stanford.EDU
Tue Jul 27 19:08:03 CEST 2021

One beautiful thing about pd is the “-nogui” flag, which can make pd feel like (and be) a much more lightweight solution for these kind of “glue code” tasks.


CCRMA Technical Director
650-723-4971 x304
Pronouns:  he, his, him

> On Jul 27, 2021, at 5:54 AM, Brandon Hale <bthaleproductions at gmail.com> wrote:
> I have another pd method (using purr-data) for you which might be a tiny bit simpler than using |hid|:
> In purr-data, you can use the object |legacy_mousemotion| which will then output x and y position of the mouse for the pd current window.
> If you like using pd-l2ork 1.0 instead, you can actually use cyclone's |MouseState| object, which gives you a similar feature set (although I like |MouseState| better, it seems to work smoother).
> You could then use these to make midi messages inside pd and output it through purr-data/pd-l2ork's midi output.
> Brandon Hale
> On 7/27/21 4:33 AM, Will Godfrey wrote:
>> On Tue, 27 Jul 2021 10:03:33 +0200
>> Lorenzo Sutton <lorenzofsutton at gmail.com> wrote:
>>> Hi Will,
>>> On 27/07/21 09:22, Will Godfrey wrote:
>>>> Does anyone know of software that can generate MIDI messages from a touchpad?
>>> If, as I understand it, you mean a latptop touchpad (i.e. thing used
>>> instead of a real mouse with your finger :-) ) Pure Data can definitely
>>> do it in many different ways.
>>> The Pd 'vanilla' way would probably be using a canvas object(s) and
>>> tracking movement as you 'drag' them around.
>>> There are a bunch of Pd externals (i.e. libraries not included in Pd you
>>> need to compile and install separately), which can also do this in
>>> various ways. [1]
>>> Once you have the touchpad detection / setting setup Pd has a set of
>>> inclued midi sending obejects which are really easy to use to send CC,
>>> notes etc.
>>>> The idea would be to send CCs to a sequencer or soft synth, but being able to
>>>> send it to an external hardware device would also be very useful.
>>> MIDI objects receive/send alsa-midi so you can route them to any
>>> sequencer, synth or hardware device which can receive alsa-midi.
>>> Hope this helps.
>>> Lorenzo.
>>> [0] https://puredata.info/
>>> [1] There is also a Pd 'distribution' which comes packed with many many
>>> externals out of the box, Purr Data: https://www.purrdata.net/
>> Thanks for all of this Lorenzo. I had been hoping for something lightweight,
>> however if I can find that round tuit I seem to have lost, this is certainly an
>> interesting (and potentially flexible) way of solving the problem.
>> Will.
> _______________________________________________
> Linux-audio-user mailing list
> Linux-audio-user at lists.linuxaudio.org
> https://lists.linuxaudio.org/listinfo/linux-audio-user

More information about the Linux-audio-user mailing list