Mackie DL806 Reference Manual page 133

Show Images — This allows you to select the channel image from photos that are currently
in use on the current show. The list will display all images currently in use. Tap the photo you
would like to use from this list.
A maximum of 64 images may be used per show. However, if the same image is used
on multiple channels, it only counts as one image (if the image has been selected from show
images and not multiple times from the photo library). Icons do not count toward the 64.
More information about the file system [shows, snapshots, etc.] begins on page 102.
Clear Image — Believe it or not, tapping here will clear the image for that channel.
This removes the image from the channel and, if it isn't used elsewhere, from the
Current Show and the Show Images list.
Since we already named channel 1 the kick drum, we might as well go with the
kick drum icon to boot, right? Tap the kick drum icon in the upper-left corner.
Channel 1 is set: name and image.
As seen in all of these images, a small number resides In the upper-left corner
regardless of name and/or image. This number represents each channel and
it cannot be changed or removed. Trust us, it's for the best, as it is for easy
identification of each mic pre.
As mentioned previously, two adjoining mono input channels may be linked together into a single stereo
channel strip. This is ideal for stereo input sources such as keyboards, submixer outputs, vocal processors
and more. When linked, the level control, EQ, gate and compressor are adjusted with a single set of controls!
Linking channels is easy. After tapping a Channel ID button, you will see an option to "Link Ch X over Ch X".
Tap it! A popover will display asking you to confirm. A visual difference between unlinked and linked
channels is displayed below. Follow the same steps outlined above to unlink channels.
Unlinked
Odd-numbered channels will link to the next (even-numbered) channel [e.g. 1-2, 3-4, etc],
while even-numbered channels will link to the previous (odd-numbered) channel
[e.g. 10-9, 12-11, etc].
The linked over channel will take on all of the attributes [EQ settings, gate and compressor
settings, delay and reverb settings, etc.] of the tapped Channel ID button. In other words,
if you link channel 1 over 2, the resulting stereo channel will take on all of the settings of
channel 1. However, if you link channel 2 over channel 1, the resulting stereo channel will
take on all of the settings of channel 2.
Mackie DL806 and DL1608 Reference Guide
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Linked