It seems that your 7 channel Megabar Fixture is not right. Right channels are:
American DJ MEGA BAR 50 RGB 7 channel
1. 0-255 RED 0-100%
2. 0-255 GREEN 0-100%
3. 0-255 BLUE 0-100%
4. Color Macros
0 OFF
1-7 Color 1
8-15 Color 2
16-23 Color 3
24-31 Color 4
32-39 Color 5
40-47 Color 6
48-55 Color 7
56-63 Color 8
64-71 Color 9
72-79 Color 10
80-87 Color 11
88-95 Color 12
96-103 Color 13
104-111 Color 14
112-119 Color 15
120-127 Color 16
128-135 Color 17
136-143 Color 18
144-151 Color 19
152-159 Color 20
160-167 Color 21
168-175 Color 22
176-183 Color 23
184-191 Color 24
192-199 Color 25
200-207 Color 26
208-215 Color 27
216-223 Color 28
224-231 Color 29
232-239 Color 30
240-247 Color 31
248-255 Color 32
5. Strobe
0-15 No Strobe
16-255 Strobe slow-fast
6. Programs
0-127 OFF
128-159 Color Mixing
160-191 3 Color Change
192-223 7 Color Change
224-255 Sound active
7. Master Dimmer
1-255 0-100%
Thanks,
Mikko