[PD] bendin-bendout under Linux

[Nicola Pandini]

Il 04/10/2011 06:21, Ingo ha scritto:
>
>> -----Ursprüngliche Nachricht-----
>> Von: pd-list-bounces at iem.at [mailto:pd-list-bounces at iem.at] Im Auftrag von
>> Lorenzo Sutton
>> Gesendet: Montag, 3. Oktober 2011 22:25
>> An: pd-list at iem.at
>> Betreff: Re: [PD] bendin-bendout under Linux
>>
>> On 03/10/2011 20:13, Nicola Pandini wrote:
>>> Il 03/10/2011 19:33, Mathieu Bouchard ha scritto:
>>>> Le 2011-10-03 à 19:29:00, Nicola Pandini a écrit :
>>>>
>>>>> Hi, I'm trying to build a patch that routes notes, CCs and pitch bend
>>>>> from a keyboard to different synths.
>>>>> Everything is ok for notes and CCs, but I have a problem with the
>>>>> pitch bend.
>>>>> It seems that [bendout] can outputs only a range between 0 and 16384,
>>>>> while the correct range should be -8192 +8192.
>>>>> I tried to force negative values but it seems that bendout can't go
>>>>> below 0.
>>>> use [- 8192]
>>>>
>>>> because 0-8192 = -8192
>>>> and because 16383-8192 = 8191
>>>>
>>>> that is, in unsigned values, 8192 is the middle of the range.
>>>>
>>> You right, but I already tried this:
>>>
>>> #N canvas 93 232 450 300 10;
>>> #X obj 82 77 bendin;
>>> #X obj 82 102 - 8192;
>>> #X obj 82 130 bendout 1;
>>> #X connect 0 0 1 0;
>>> #X connect 1 0 2 0;
>>>
>>> And bendout had only a range from 0 to 8192, it didn't go below 0.
>>>
>> Strange I tested (with rosegarden and gmidimonitor) on 0.43 and it
>> worked outputting the whole range -8191 to 8192.
>> Lorenzo
>
> This depends on how the software is "displaying" pitchbend. Pd always uses 0
> - 16383. MIDI does always transmit 7-bit values from 0 - 127 (except for
> SysEx). This is a 14-bit message cascaded by two 7-bit messages - each going
> from 0 - 127.
>
> Generally the msb is being used and the lsb is left at 0 (maybe it's the
> other way around). This means the center value of Pitchbend is 64 0.
> You can eliminate the second byte by dividing by 128.
>
> For displaying the value is offset by 8192 by certain softwares to show
> negative values. Some people might think it looks more understandable to
> have the same range going negative or positive for bend down / bend up. But
> the numbers still go from 0 - 16383. Center is 8192 or 64 0.
>
> Ingo
>
>
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Thanks for all the feedbacks.
On Debian Wheezy I tried the following setup:
vkeybd -> Pd -> qmidiroute

On 0.42.5, the numbers starts from 0 even with the [- 8192] object.
On 0.43, as Lorenzo said, I can get the correct range (-8192  8192), so 
it seems to be only a 0.42.5 issue.

-- 
Nicola Pandini
http://www.cassandraweb.it
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