This is the my thread of thought...
Low tone = down = zero
High tone = up = one
(g) = growl, - is a gap
- D U D U U D(g) U - D D U D(g) U - U D D U U D(g) U - D U U D D U(g) U -
0101101 - decimal 45 - ascii (hyphen)
00101 - decimal 5 - ascii P
1001101 - decimal 77 - ascii M
0110011 - decimal 51 - ascii 3
We don't know the offset, so that gives up one of these...
-PM3 ; PM3- ; M3-P ; 3-PM
And for good measure, I also checked:
[-5:77:51], [77:51:-5], [51:-5:77], [5:77:51], [77:51:5], [51:5:77]... no hits for systems.
Also, if you use the growls as the cutoffs it makes even less sense.
1010110 - decimal 86 - ascii V
10010 - decimal 18 - (don't know?)
1100110 -decimal 102 - ascii f
1011001 - decimal 89 - ascii Y
Inverting the sequences also doesn't seem to make sense.