Here's a transcription of Mykl Atrum's recording of the FFUP signal- the new one you get when you look at it from the end that points to Merope.
as little interpretation as possible- I tried to just write what I heard as the different sounds in the signal. Anyone who has heard it knows it's a crunchier fuzzier signal than the others, with echo, reverb, wobbly frequency shifts etc. I'm sure other people have other takes on it and I encourage people to post them.
https://docs.google.com/document/d/1FQ5JPxUN-W3Dfn5OWxH_AzunGTex6uIuOrd7-kKC5Rg/edit?usp=sharing
sections = sounds after each howl
. = the fast dits before each set of three longer tones
h = high tone
l = low tone
# = rising flangey sounding chirp tone, as heard after the 4th triplet tone in the file
section 1 - 4 has 1 # sound per section
section 5 has 3 of them
section 1
HOWL
..hlh..lll..hlh..hll#hhl..lll..lhl..hhh
section 2
howl
..hhl..hlh..hll..hhl#hll..lll..hlh
section 3
howl
..hlh ..hhl ..llh ..lhl..lhl # ..hll ..hhl ..hhh
old style faint tone triplet barely audible here- (hlh)
section 4
howl
..hll ..hlh ..hlh ..hhh ..hhl # ..hll ..hhl ..hhh
section 5
howl
..lhh ..hlh ..hhh ..lll ..hlh ..hhl ..lll ..lhl ..hhl ..hlh ..hll # ..hhl ..lll ..lhl ..hhh pause ..hhl ..hlh ..hlh ..hhl ..lhh ..hlh ..hlh ..hhl # ..hhl ..lll ..lhl pause ..hlh ..hhl ..hhh ..hll ..lhh ..hll # ..hhl ..lll ..lhl ..hhh