no-reply@allegro.cc (Mark Oates) — Tue, 09 Jan 2007 22:09:02 +0000

I'm writing a sequencer and I'm using allegro's midi routines. Each time I start the program, allegro (or something) throws out midi messages to all 16 channels to set their respective volumes to 0. So I wrote this simple program:

1#include 
2 
3void note_on(int channel, int pitch, int vel)
4{
5   unsigned char msg[3];
6 
7   msg[0] = 0x90+channel;
8   msg[1] = pitch;
9   msg[2] = vel / 2;
10 
11   midi_out(msg, 3);
12}
13 
14 
15void main()
16{
17     allegro_init();
18     
19     install_sound(DIGI_NONE, MIDI_AUTODETECT, NULL);
20     
21     note_on(0, 60, 64);
22     
23} END_OF_MAIN();

and the output of my sampler (Gigastudio) shows the following messages are sent to it once I run the program:

1 
2Time
3Stamp   Port   Chan    Event        Data 1      Data 2    Flags
4============================================================================================== 
572649  1  1  Note On      C3      32 (velocity)  0x0  
672649  1  1  Controller Change  7 Channel Volume (7)  0    0x0  
772649  1  2  Controller Change  7 Channel Volume (7)  0    0x0  
872649  1  3  Controller Change  7 Channel Volume (7)  0    0x0  
972649  1  4  Controller Change  7 Channel Volume (7)  0    0x0  
1072649  1  5  Controller Change  7 Channel Volume (7)  0    0x0  
1172649  1  6  Controller Change  7 Channel Volume (7)  0    0x0  
1272649  1  7  Controller Change  7 Channel Volume (7)  0    0x0  
1372649  1  8  Controller Change  7 Channel Volume (7)  0    0x0  
1472649  1  9  Controller Change  7 Channel Volume (7)  0    0x0  
1572649  1  10  Controller Change  7 Channel Volume (7)  0    0x0  
1672649  1  11  Controller Change  7 Channel Volume (7)  0    0x0  
1772649  1  12  Controller Change  7 Channel Volume (7)  0    0x0  
1872649  1  13  Controller Change  7 Channel Volume (7)  0    0x0  
1972649  1  14  Controller Change  7 Channel Volume (7)  0    0x0  
2072649  1  15  Controller Change  7 Channel Volume (7)  0    0x0  
2172649  1  16  Controller Change  7 Channel Volume (7)  0    0x0  
2272649  1  1  Controller Change  All Notes Off (123)  0    0x0  
2372649  1  1  Controller Change  All Sounds Off (120)  0    0x0  
2472649  1  2  Controller Change  All Notes Off (123)  0    0x0  
2572649  1  2  Controller Change  All Sounds Off (120)  0    0x0  
2672649  1  3  Controller Change  All Notes Off (123)  0    0x0  
2772649  1  3  Controller Change  All Sounds Off (120)  0    0x0  
2872649  1  4  Controller Change  All Notes Off (123)  0    0x0  
2972649  1  4  Controller Change  All Sounds Off (120)  0    0x0  
3072649  1  5  Controller Change  All Notes Off (123)  0    0x0  
3172649  1  5  Controller Change  All Sounds Off (120)  0    0x0  
3272649  1  6  Controller Change  All Notes Off (123)  0    0x0  
33 
34Time
35Stamp   Port   Chan    Event        Data 1      Data 2    Flags
36============================================================================================== 
3772649  1  6  Controller Change  All Sounds Off (120)  0    0x0  
3872649  1  7  Controller Change  All Notes Off (123)  0    0x0  
3972649  1  7  Controller Change  All Sounds Off (120)  0    0x0  
4072649  1  8  Controller Change  All Notes Off (123)  0    0x0  
4172649  1  8  Controller Change  All Sounds Off (120)  0    0x0  
4272649  1  9  Controller Change  All Notes Off (123)  0    0x0  
4372649  1  9  Controller Change  All Sounds Off (120)  0    0x0  
4472649  1  10  Controller Change  All Notes Off (123)  0    0x0  
4572649  1  10  Controller Change  All Sounds Off (120)  0    0x0  
4672649  1  11  Controller Change  All Notes Off (123)  0    0x0  
4772649  1  11  Controller Change  All Sounds Off (120)  0    0x0  
4872649  1  12  Controller Change  All Notes Off (123)  0    0x0  
4972649  1  12  Controller Change  All Sounds Off (120)  0    0x0  
5072649  1  13  Controller Change  All Notes Off (123)  0    0x0  
5172649  1  13  Controller Change  All Sounds Off (120)  0    0x0  
5272649  1  14  Controller Change  All Notes Off (123)  0    0x0  
5372649  1  14  Controller Change  All Sounds Off (120)  0    0x0  
5472649  1  15  Controller Change  All Notes Off (123)  0    0x0  
5572649  1  15  Controller Change  All Sounds Off (120)  0    0x0  
5672649  1  16  Controller Change  All Notes Off (123)  0    0x0  
5772649  1  16  Controller Change  All Sounds Off (120)  0    0x0

It seems to make sense that the "all notes off" commands come as the program is closing, but what's with the volume changes?

In my sequencer program, I noticed that the vol changes are only sent after the first midi message is sent, not when it does the install_sound().

does anybody know what might be causing this?

1	#include
2
3	void note_on(int channel, int pitch, int vel)
4	{
5	unsigned char msg[3];
6
7	msg[0] = 0x90+channel;
8	msg[1] = pitch;
9	msg[2] = vel / 2;
10
11	midi_out(msg, 3);
12	}
13
14
15	void main()
16	{
17	allegro_init();
18
19	install_sound(DIGI_NONE, MIDI_AUTODETECT, NULL);
20
21	note_on(0, 60, 64);
22
23	} END_OF_MAIN();

1
2	Time
3	Stamp Port Chan Event Data 1 Data 2 Flags
4	==============================================================================================
5	72649 1 1 Note On C3 32 (velocity) 0x0
6	72649 1 1 Controller Change 7 Channel Volume (7) 0 0x0
7	72649 1 2 Controller Change 7 Channel Volume (7) 0 0x0
8	72649 1 3 Controller Change 7 Channel Volume (7) 0 0x0
9	72649 1 4 Controller Change 7 Channel Volume (7) 0 0x0
10	72649 1 5 Controller Change 7 Channel Volume (7) 0 0x0
11	72649 1 6 Controller Change 7 Channel Volume (7) 0 0x0
12	72649 1 7 Controller Change 7 Channel Volume (7) 0 0x0
13	72649 1 8 Controller Change 7 Channel Volume (7) 0 0x0
14	72649 1 9 Controller Change 7 Channel Volume (7) 0 0x0
15	72649 1 10 Controller Change 7 Channel Volume (7) 0 0x0
16	72649 1 11 Controller Change 7 Channel Volume (7) 0 0x0
17	72649 1 12 Controller Change 7 Channel Volume (7) 0 0x0
18	72649 1 13 Controller Change 7 Channel Volume (7) 0 0x0
19	72649 1 14 Controller Change 7 Channel Volume (7) 0 0x0
20	72649 1 15 Controller Change 7 Channel Volume (7) 0 0x0
21	72649 1 16 Controller Change 7 Channel Volume (7) 0 0x0
22	72649 1 1 Controller Change All Notes Off (123) 0 0x0
23	72649 1 1 Controller Change All Sounds Off (120) 0 0x0
24	72649 1 2 Controller Change All Notes Off (123) 0 0x0
25	72649 1 2 Controller Change All Sounds Off (120) 0 0x0
26	72649 1 3 Controller Change All Notes Off (123) 0 0x0
27	72649 1 3 Controller Change All Sounds Off (120) 0 0x0
28	72649 1 4 Controller Change All Notes Off (123) 0 0x0
29	72649 1 4 Controller Change All Sounds Off (120) 0 0x0
30	72649 1 5 Controller Change All Notes Off (123) 0 0x0
31	72649 1 5 Controller Change All Sounds Off (120) 0 0x0
32	72649 1 6 Controller Change All Notes Off (123) 0 0x0
33
34	Time
35	Stamp Port Chan Event Data 1 Data 2 Flags
36	==============================================================================================
37	72649 1 6 Controller Change All Sounds Off (120) 0 0x0
38	72649 1 7 Controller Change All Notes Off (123) 0 0x0
39	72649 1 7 Controller Change All Sounds Off (120) 0 0x0
40	72649 1 8 Controller Change All Notes Off (123) 0 0x0
41	72649 1 8 Controller Change All Sounds Off (120) 0 0x0
42	72649 1 9 Controller Change All Notes Off (123) 0 0x0
43	72649 1 9 Controller Change All Sounds Off (120) 0 0x0
44	72649 1 10 Controller Change All Notes Off (123) 0 0x0
45	72649 1 10 Controller Change All Sounds Off (120) 0 0x0
46	72649 1 11 Controller Change All Notes Off (123) 0 0x0
47	72649 1 11 Controller Change All Sounds Off (120) 0 0x0
48	72649 1 12 Controller Change All Notes Off (123) 0 0x0
49	72649 1 12 Controller Change All Sounds Off (120) 0 0x0
50	72649 1 13 Controller Change All Notes Off (123) 0 0x0
51	72649 1 13 Controller Change All Sounds Off (120) 0 0x0
52	72649 1 14 Controller Change All Notes Off (123) 0 0x0
53	72649 1 14 Controller Change All Sounds Off (120) 0 0x0
54	72649 1 15 Controller Change All Notes Off (123) 0 0x0
55	72649 1 15 Controller Change All Sounds Off (120) 0 0x0
56	72649 1 16 Controller Change All Notes Off (123) 0 0x0
57	72649 1 16 Controller Change All Sounds Off (120) 0 0x0

problems with allegro's midi