another strange case
woop, things are getting again messy. we now maintain view-proxies for
unconnected inputs. this makes everything work, except the following
things that still need fixing: (1) grapheme-offset for tape play.
(2) problem with mapan when input synth disappears (no bus-writer -> last
buffer contents is looped thanks to scsynth)
solves no. 2 - grapheme offset
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