Sometimes the first part of the sequence is lost

[mrnebbi]

This may be related to #1

baseline set to 75
0 0 0 109 109 (missing the first flash)
0 0 311 312 310
0 0 109 109 109
0 0 0 129 128
0 0 368 373 369
0 0 129 128 126
M O
0 0 128 129 128
0 0 367 371 367
0 0 127 128 125
SOS
0 0 0 127 128 (missing the first flash)
0 0 367 370 366
0 0 127 125 125
IS
0 0 126 126 127
0 0 366 369 367
0 0 126 126 126
SOS