I have used pre-made printed magnets before. Works great if there is enough metal space for them. Haven't seen them for a long time and wouldn't know where to get them, but that is what google is for.
I have used these in the past also. They are called
Mag-Tags and are still manufactured by Markertek. These pre-printed tags can make for a very clean labeling method. You can also use blank mag-labels to make your own temporary labels. An advantage is that they are easily moveable. A disadvantage is that they are easily moveable! They do tend to get bumped around a
bit by the palm of your
hand while mixing and the temporary blank labels that you
mark yourself can smear depending on what type of marker is used. For them to work, the
mixer surface where you wish to place them must be metal. On mixers that do not have a metal strip or housing below the faders (or wherever) you can easily fabricate and
lay down a thin metal strip for the mag-tags to adhere to. I was raised on
mixer tape and still use it more than anything else, but Mag-Tags can work quite well also. For "permanent" sources that are always kept on the same channels,
P-Touch labels can work well also.
On another note -and I'm sure others do this - I will, on occasion,
lay a strip of tape at the top of the
mixer above the
gain knobs which helps locate a particular source quickly if I need to adjust
gain or any control near the top of a
channel strip.
Regards,
Mark