The ornamental design for an audiomixer comprising a panel and a flightcase thereof, as shown and described.
FIG. 1 is a top plan view of a variant of a panel of an audio mixer for being mounted on the lower part of a flight case, according to my claimed design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a side elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top and side perspective view thereof;
FIG. 7 is another top and side perspective view thereof; and,
FIG. 8 is a top and side perspective view of the panel of the audio mixer of FIG. 1 within a flight case in a closed configuration.