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[Len Ovens <len@xxxxxxxxxxxxx>]

I would suggest using jalv.gtk over lv2rack. Carla would be even better,
but it is not in the Ubuntu repos at this time. I am not sure what is
happening with zynjacku at this time the home page points to a git repo
that is empty (has no commits). It seems there is no upstream. LV2 has
changed and I suspect zynjacku (which is the package lv2rack comes from)
has not kept up. (last release date 2009?)

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https://bugs.launchpad.net/bugs/1585007

Title:
  gxtuner hangs lv2rack

Status in Ubuntu Studio:
  New

Bug description:
  Ubuntustudio 15.04 both as installed offline from DVD, and all
  upgrades done, on 2 different amd64 machines:

  When running LV2Rack, loading an effect for the first time triggers a
  scan, that hangs when processing gxtuner, a URL is shown.

  After some reinstalling packages and attempting downgrade of zynjacku
  that lv2rack belongs to, now finally I got things working by renaming
  /usr/lib/lv2/gxtuner.lv2 to ./gxtuner.lv2.bak .

  Reading manpages, namely slv2_world, is what set me on the track.

  So the primary bug, I assume, is something malformed in gxtuner.lv2 as
  found in the distro (on top I understand that gxtuner could come from
  different packages).

  Secondary, and more seriously, this leads to a hang and complete
  unusability of lv2rack .

  Ardour3 does not show any problems with scanning lv2 effects, so
  looking at the different ways of lv2rack and ardour to find lv2
  plugins might help pinpoint the problem, possibly in slv2

  Since I live offgrid and offline, I cannot be counted on for follow
  ups too much

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