Subject: Re: [linux-audio-user] remapping midi notes
From: Frank Barknecht (fbar_AT_footils.org)
Date: Wed Jul 14 2004 - 17:45:51 EEST
Hi,
Joey Reid wrote:
> On Jul 13, 2004, at 8:02 PM, Joachim Schiele wrote:
>
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>> On Tuesday 13 July 2004 20:49, Joey Reid wrote:
>>
>> You could write a midi filter for that.
>> Read this:
>> http://www.suse.de/~mana/alsa090_howto.html
>>
>
> well, i was hoping i wouldn't have to learn C to do this, but I suppose
> I can't expect ot not get my hands dirty with this, can I ;-)
Some people here might already wait for me suggesting to take a look at
Pd again (http://www.pure-data.info). It is very easy to create all
kinds of note and control filters in Pd, if you first learn a tiny bit
of Pd.
The .pd-files /usr/lib/pd/doc/2.control.examples/17.PART3.midi.pd and
/usr/lib/pd/doc/5.reference/help-midi.pd show the available midi objects
inside Pd which are for example [notein] and [noteout], [ctlin],...
To create mappings, the [route], [select], [moses], [pack], [unpack] and
of course all math objects like [>] or [<] are useful, as Pd treats midi
data as simple lists of numbers. So a simple midi filter, which just
accepts all notes on channel 7, then sends the channel-7 notes to
channel 1 would look like this in ASCII-patching:
[notein 7]
| /
[pack 0 0 1]
| | \
[unpack 0 0 1]
| | /
[ noteout ]
(Unfortunatly noteout doesn't accept a channel argument like notein does.)
Ciao
-- Frank Barknecht
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