Submixing (internal):
---------------------

	Version 1.07 introduces up to 8 stereo internal submixes or groups.  
This allows you to assign all your drum tracks, for example, to a single stereo
mix and apply EQ or compression or automate their volume as a whole before it 
reaches the main mix.  To assign channels to a submix group, in the faders.txt 
file use the command "sub".  Then tab, then the submix number (1-8), then tab, 
and then a list of the channels to assign to the submix separated by commas.  
For example, assigning channels 1-5 to submix 1 would be done as follows:

sub	1	1,2,3,4,5

In making the assignment, channels can be in any order.  You can also assign 
the same channel to multiple submixes, such as channel 1 here:

sub	1	1,2,3
sub	2	1,4,5     

	If a channel is not assigned to a submix it will automatically be 
assigned to the master output.  On the other hand, if you assign channel 1, for 
example, to a submix it will no longer be routed to the master output directly.  
But, you can force it to also be routed to the master if you wish by assigning 
it to sub number 0.

	In the faders.txt file, a submix can be muted with the command "submu", 
followed by tab and the submix number.  A submix can be soloed by the command 
"subso" followed by tab and the submix number.  You can solo multiple submixes 
at the same time.

	It is crucial to set an initial volume, just like you do with channels, 
for the submixes.  Whether adding effects or manipulating volume, you do 
everything the same as you would for a regular channel except add a "G" and a 
tab before you enter the channel or in this case submix/group number.  For 
example,

t	0	0	0
v	G	1	-6

This sets the the group or submix 1 to a volume of -6 dB at time zero.
Or, to place a 200 Hz high pass filter on submix 1:

hp	G	1	200

Note, because adding the "G" creates an extra tab field, it may detract
visually when intermingled with regular channel volumes.  There are two
alternatives:  One is to put all submix volumes in a different part of the
faders.txt file with their own time settings.  The other is to use the submix
channel numbers directly without the "G" field.  The submix channel numbers 
begin after regular channel numbers (1-127).  Submix channels are 127-135.  So,
you could set submix 1's volume to -8 dB in the following way

v   128	  -8 



Submixing (external):
---------------------

	You may ask the program to look for a different track list and fader 
file besides the default "faders.txt" and "tracks.txt."  You can just put your 
drum tracks in a separate track list and call it drums.txt, for example.  Plus 
make a file for the drums faders/effects called dfaders.txt, for example.  When
you run Mixer4 from the command line you would enter these file names in this 
order: 

mixer4 drums.txt dfaders.txt

	This will result in a mix with a file name that you picked in the 
dfades.txt file, let's say it's "drumsub."  Let's suppose you do something 
similar for guitars and get a mix file called "gtrsub."  Now you simply combine
the submixes with one additional fader file and track list.  During this final 
summation you may of course apply more processing to "drumsub" and "gtrsub."  
This process is not particularly time consuming because each submix will go 
quite quickly because there are fewer tracks than if you had mixed all the 
song's tracks at once.   Also, if using the power of a script you can do 
everything in one command!  Your operating system should allocate each mix to 
its own core which will additional speed up the mix time.

	You may find the biggest bottleneck in terms of speed is disk read and 
write time.  Therefore, it may be even more efficient to have different submix 
source tracks being accessed from different hard drives. 

Note that beginning in version 19c you may enter an alternate name for the 
faders.txt file as the 3rd command line argument.  For example,

mixer4 drums.txt dfaders.txt dprefs.txt