In a Stellaris RP I'm doing, we recently got a signal titled "ghost6.wav." It was morse code, that decoded to the following:

106 162 145 145 144 157 155 40 151 163 40 153 145 171 56 12 12 160 137 50 50 51 77 113 160 50 101 62 74 52 137 45 164 52 63 101 44 46 77 62 75 175 100 53 47 170 140 165 170 64 101 175 52 167 110 72 172 52 171 174 163 167 171 150 162 51 137 63 41 50 42 102 172 174 170 52 174 166 171 174 50 50 51 171 160 47 137 64 44 47 63 41 175 52 113 164 74 46 171 47 51 172 140 174 176 51 44 73 172 167 53 43 170 50 42 44 166 51 101 46 41 162 140 47 111 46 52 143 73 164 166 50 164 50 52 144 174 170 140 163 51 167 53 47 44 170 104

We got another signal that's a heavily distorted version of I Wish I was in Dixie. After I identified the song, the GMs said it was funny we forgot about these numbers, so I suspect the two are somehow related.