[LAD] LV2 Pitch bend control port (and function)

Rui Nuno Capela rncbc at rncbc.org
Thu Oct 2 16:48:05 UTC 2014

On 10/02/2014 04:42 PM, Harry van Haaren wrote:
> Hi,
> When replying, please be careful to reply to the list, as well as the
> person: otherwise 1/2 a conversation gets lost ;) I've included
> linux-audio-dev at lists.linuxaudio.org  again.
> On Thu, Oct 2, 2014 at 4:13 PM, Phil CM <philcm at gnu.org> wrote:
>> On 02/10/2014 14:13, Harry van Haaren wrote:
>>> On Thu, Oct 2, 2014 at 1:14 PM, Phil CM <philcm at gnu.org> wrote:
>>>> I need a synth with a pitch control. A synth that can be controlled to
>>>> produce all tones between one note and another, say from a2 to c3 in an
>>>> anti-aliased way, like what you would get in pd by altering the pitch of
>>>> a
>>>> sine wave.
>>> Hi Phil,
>>> To start, welcome to LV2 programming: audio plugins are fun and complex
>>> area!
>> Thanks :)
>>> If you haven't already, I suggest you checkout the "plugins" directory
>>> in the lv2 repository. It provides the best example code you'll find,
>>> and accompanying http://lv2plug.in/book/  provides detailed
>>> explainations and best-practices.
>> This is my bedside reading for the next days to come ; Too bad the examples
>> do not include a simple synth :(
> That's what I thought too, so I wrote a sin-generator a few years ago:
> it apparently hasn't been included in the lv2 source yet. I'll CC
> David Robillard, and see if that's an option :)
> https://github.com/harryhaaren/lv2/tree/master/plugins/eg-sinsynth.lv2
> I remember now that it doesn't accept MIDI input yet: which means it
> doesn't handle notes, or pitch bend. These can be added quite
> trivially, and is something that I'd be willing to collaborate on?
> You'd learn how to "manually" use MIDI, and we'd have a better
> resource.
> Please note that the GUI code is NOT something to learn from: its not
> advised to use GTK for plugin UI's.
> That said, the code is pretty short, and does actually work: perhaps
> learn from it, and then use a more lightweight UI framework ( NTK
> being my / OpenAV's favorite: http://non.tuxfamily.org/wiki/NTK )
>> OK, so I'm going to get back once I managed to make a basic synth to get to
>> this pitch bending special case.
> Sure, good plan.
>>> I do strongly advise to checkout the plugins: they are a brilliant
>>> reference to make LV2 plugins.
>> Again, it's really a shame that there is no sound synthesis plugin
>> demonstrated... I'm going to study them all anyway.
>>> Ok, that's quite a lot of info already I think!
>>> LV2 specific development:
>>> #lv2 on irc.freenode.net  (I'm "HarryHaaren", say Hi if/when you're on)
>>> Mailing list (low-traffic):
>>> http://lists.lv2plug.in/listinfo.cgi/devel-lv2plug.in
>>> Cheers, -Harry
>> Thanks a bunch, Harry
> You're welcome. I like LV2, its the way forward: if I can help out
> somewhat (apart from developing stuff myself) its also a pleasure, I
> know LV2 can be a touch daunting, and a helping hand does make it a
> lot easier there!
> Cheers, -Harry

synthv1 lv2: set each DCO Bandl(imit) On; set DEF Pitchbend range to the 
max or else.

rncbc aka Rui Nuno Capela
rncbc at rncbc.org

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