DataType_Sound_Signal was made to play sound for another project. 
I release it (with sources) if it can be useful for someone. 

DataType_Sound_Signal use 
	- the sound Datatype to play sound
	- the messaging processus to pass order to the sound player (STOP / volume UP /
volume DOWN) 

I am not able to use the SDTA_Pan balance, is it work for somebody ? On my
system, no effect, SDTA_Pan is always 0.

DataType_Sound_Signal is made of 2 programs
	
1) DataType_Sound 
	the sound player. 
		Sound play will stop if the sound is over or if CTRL-D or if the second
program send a STOP request
	usage : 
		DataType_sound Test.wav number_of_cycles volume volume_increment num_msg_port
[debug]

		where Test.wav is the name of a sound file
		where number_of_cycles is the number of repetition of the sound  (0 is for
infinite loop)
		where volume can take the the value 0 (no sound) to 64 (highest volume)
		where volume_increment is the number of volume who will be decreased or
increased when the program will received the order DOWN or UP
		where num_msg_port is the number who will be concatenate to
DataType_Sound_Port_ to created the communication port.
			the second program (DataType_Sound_Break) will communicate on this port.
			It's possible, therefore, to launch multiples sounds in parrallel.
		where DEBUG will print some debug info (optional)
	

2) DataType_Sound_Break
	to control the sound player if needed. 
	This program bind itself to the message port of the player program and can send
to him some basic requests
	
	usage :
		DataType_Sound_Break UP/DOWN/STOP num_Msg_Port [debug]
		where UP is to increase the sound volume by volume_increment
		where DOWN is to decrease the sound volume by volume_increment
		where STOP is to stop the sound play
		where num_Msg_port is the number who will be concatenate to
DataType_Sound_Port_ to find and bind the communication port.
			the request message will be sent to the first program (DataType_Sound) by
this port.
		where DEBUG will print some debug info (optional)

Example of 2 sounds played in parrallel with 2 controller : 

1) on a first shell 
	DataType_Sound Test.wav 0 32 5 01 DEBUG 	
		will play the test.wav sound forever (0) at 50% volume (32) with a volume
increment of 5. The message port DataType_Sound_Port_01 is created (01)
		Debug mode on (DEBUG)

2) on a second shell 
	DataType_Sound Test.wav 999 64 10 02 DEBUG 
		will play the test.wav sound 999 times (999) at 100% volume (64) with a volume
increment of 10. The message port DataType_Sound_Port_02 is created (02)
		Debug mode on (DEBUG)

3) on another shell
	DataType_Sound_Break UP 01 DEBUG  
		will increase the volume of the 1) program of 5 (volume_increment) 
	DataType_Sound_Break STOP 01 DEBUG  
		will stop the sound player 1) 

4) on another shell
	DataType_Sound_Break DOWN 02 DEBUG  
		will decrease the volume of the 2) program of 10 (volume_increment) 
	DataType_Sound_Break UP 02 DEBUG  
		will increase the volume of the 2) program of 10 (volume_increment) 
	DataType_Sound_Break STOP 02
		will stop the sound player 2) 


DataType_Sound_Signal is based on the samples from 
	http://wiki.amigaos.net/index.php/Datatypes_Library	
and  http://obligement.free.fr/articles/amigae_datatypes.php	
I have just added the messaging, volume control and end sound signal.

Datatype and messaging are great functionnality :)

I will be happy, if it can be useful to someone
Guillaume 'zzd10h' Boesel