Re: [linux-audio-dev] strange MIDI messages when receiving programchanges ??

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Subject: Re: [linux-audio-dev] strange MIDI messages when receiving programchanges ??
From: Jaroslav Kysela (perex_AT_suse.cz)
Date: Mon Mar 20 2000 - 12:40:03 EET

On Mon, 20 Mar 2000, Benno Senoner wrote:

> Hi,
> I have an old cheap master keyboard here
> ( branded Commodore :-) )
>
> FYI: It supports running status
> It has + / - keys for sending programchanges
>
> plus keys from 0 to 9 for entering program changes
> manually.
>
> When I use the +/- keys all seems fine
> only the program changes message are sent,
>
> but when I use the numeric keys, the keyboards
> seems to send PARAMETER messages along with
> the program change:
>
> keep reading below for a pratical example:
> (read buf values in HEX)
>
> programchange 01 using plus key (OK)
>
> seq=1 read buf=c0
> seq=2 read buf=01
>
> programchange 02 using plus key (OK)
>
> seq=3 read buf=c0
> seq=4 read buf=02
>
> programchange 02 using the "2" key (STRANGE)
>
> first it sends 0xb0 , which is a PARAMETER message
> followed by 2 bytes ( 0x00,0x00) which is
> controller 0 with value 0
> then 0x20 is sent: since bit 7 is 0 , it indicates
> the running status mode (still PARAMETER message,
> but without status byte)
> 0x20 is the first argument ( controller 32 (in decimal))
> controller value 0
> then finally the program change appears ( 0xc0 , 0x02)
>
>
> seq=5 read buf=b0
> seq=6 read buf=00
> seq=7 read buf=00
> seq=8 read buf=20
> seq=9 read buf=00
> seq=10 read buf=c0
> seq=11 read buf=02
>
>
> programchange using "3" key
>
> seq=12 read buf=b0
> seq=13 read buf=00
> seq=14 read buf=00
> seq=15 read buf=20
> seq=16 read buf=00
> seq=17 read buf=c0
> seq=18 read buf=03
>
> program change using "4" key
>
> seq=19 read buf=b0
> seq=20 read buf=00
> seq=21 read buf=00
> seq=22 read buf=20
> seq=23 read buf=00
> seq=24 read buf=c0
> seq=25 read buf=04
>
>
> Any thoughts ??
>
> should I just ignore these PARAMETER messages ?
> I looked at the midi controller table,
> and controllers 0 and 32 do not have any special meanings.

They control the bank number (MSB/LSB).

                                        Jaroslav

-----
Jaroslav Kysela <perex_AT_suse.cz>
SuSE Linux http://www.suse.com
ALSA project http://www.alsa-project.org

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