I stated trumpet to give an example. I am processing pipe organs. Pipe 
organs have different stops representing different sounds some emulating 
and therefore named after the instruments they represent. Each stop 
activates that sound for a rage of keys, usually around 61 keys. Each 
key pressed will open an airflow vent that channels wind into a pipe and 
sound is produced. Successive keys will generate sound from one 
(sometimes as many as 20+ pipes) of an array of pipes positioned across 
from left to right so one note sounds from a pipe to the left and the 
next, a pipe on the right, the next from the left and so on. Since these 
pipes in real life are next to each other and occupy a fairly wide space 
the stereo recording are used to give that sensation of the pipes' 
spacial distribution when played digitally. So it's not a matter of a 
simple left and right.

Loops are needed to perpetuate the sound for the duration of time a key 
is pressed even though a recorded sample may be of just 6 seconds' 
duration. The software loops the sound until the key is release. I have 
mentioned this before.

This video may give a bit more insight in what is to be achieved: 
https://youtu.be/dsoWg38TjpU

Mark


On 09/12/2016 14:21, Jan Stary wrote:
> On Dec 09 00:23:21, marcusfb@gmail.com wrote:
>> The task I am now performing is basically reversing part of the process that
>> was done to these files after loops and markers were created.... that of
>> recombining the L and R channels back into single stereo samples preserving
>> the processing done before the separation. Loops and markers are created in
>> positions that apply to both channels in a stereo file so they are bound to
>> match exactly when recombining them again.
> One more question: if these are samples of real instruments,
> how much do you need them to be stereo? For e.g. a trumpet,
> can you just take the "left trumpet sample" an pronounce it
> the stereo trumpet", just duplicating the channel? Or is there
> an actual difference? (There will be for pipe organs of course).
>
> But that's probably the same problem when done with SoX:
> you would lose the markers.
>
> 	Jan
>
>
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