Help with scholium to Aristophanes

Friends,  

There are some famously difficult lines at Clouds 761-763. I think
Henderson does a good job of translating the textus receptus in the
recent Loeb edition: 

Now don't keep winding yourself up in your thoughts; rather, unreel your
mind into the air, like a beetle leashed by its leg with a thread.

μή νυν περὶ σαυτὸν εἶλλε τὴν γνώμην ἀεί,
ἀλλ' ἀποχάλα τὴν φροντίδ' εἰς τὸν ἀέρα,
λινόδετον ὥσπερ μηλολόνθην τοῦ ποδός. 

What I'm interested in the extremely rare word ἀποχάλα. LSJ's definition
of *apokhalaô* is the rather uninformative "slack away" [say *what*? -
MC]; the DGE does much better by proposing "soltar, dejar libre, relajar
" 

But what I'm really interested in is one of the scholia to this line,
which reads:  

ἤγουν εἰς διάλυσιν δίδου σαυτόν ( [1]Cang) [1]. 
Now, I don't have access to Koster's edition (_Prolegomena de comoedia.
Scholia in Acharnenses, Equites, Nubes _[_Scholia in Aristophanem_
1.3.2, Groningen: Bouma, 1974]), so I have two questions: 

1. What's meant by the abbreviation ( [1]Cang) [1].? 
2. Am I right in translating the scholium as "dissolve yourself"? Or is
there any other possible interpretation? 

Many thanks in advance 

Mike Chase 
CNRS Centre Jean/Pépin - ENS/U. of Victoria 
  

Links:
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[1]
https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fstephanus.tlg.uci.edu.proxy.rubens.ens.fr%2Fhelp%2FBetaManual%2Fonline%2FSB1.html&data=02%7C01%7CCLASSICS-L%40lsv.uky.edu%7C397409923dfe4b937d6108d73d2e41b8%7C2b30530b69b64457b818481cb53d42ae%7C0%7C0%7C637045141204877056&sdata=OaNaR9Tyk50m9EFyWE88ErcjsSV62YsDk7dnoAeHYo0%3D&reserved=0