Do we want LV2 and jack-midi?

Hi all,

As a new release approaches, I think one of the latest threads about 
synths, jack (midi) etc. re-prompts the longstanding questions:

1. do we want LV2 in Rosegarden?
2. do we want Jack-MIDI?

IMHO (and with an updated perspective compared to my opinions in the past):

1. I think on the one hand this would be great because LV2 is the 
current de-facto standard on Linux and would open up many possibilities 
if integrated natively.
The key question, though, is: would it make sense to support LV2 if then 
user's aren't able to 'generate' (i.e. save as, say, a WAV file), the 
final result of their musical masterpiece made in Rosegarden?
I'm thinking of software like Ardour, Qtractor and LMMS (the latter 
notably also not supporting LV2 yet), which are potentially 
self-contained in that you add/use plugins, and when done export to a 
final audio file.
If Rosegarden were to support LV2 it should also support audio export of 
the final result, otherwise it would mostly generate user frustration.
Self-contained in audio is a double-edged sword which easy becomes 
obsolete when relying on plugins which will eventually be un-maintained 
or become incompatible (this applies also outside the Linux ecosystem - 
think RTAS or DirectX).

2. jack-midi feels like a higher priority. Why? Because it would allow 
to e.g. connect to jack-midi applications like Carla (multi-format 
plugin host) or Ardour (to name a couple) and better support modularity 
within the current Linux ecosystem where it seems that ALSA Midi is 
considered to be deprecated. True there is a2j but that's really a bit 
of a work-around.

My two (user-oriented) cents and would be interesting to hear other 
opinions.


Lorenzo.