Another thing here that could do with a bit of testing: I've just got
rid of the Buffering tab from the sequencer configuration page, and
added instead a new option to the Record & Mix tab to choose a mode
("Low latency" or "Buffered") in which you want the sequencer to do
its mixing.
"Buffered" mode is basically what we were doing before: it runs the
mix and plugin code in its own thread with a long buffer between it
and the RT audio thread. This has the nice theoretical advantage of
allowing us to use non-RT-safe plugins, etc, but it has the
disadvantage that because those plugins are run "in advance", they
get a delay on real-time input such as notes pressed on a MIDI
keyboard -- very relevant for synths.
"Low latency" mode uses the same mix and plugin application code, but
runs it in the RT thread without additional buffering. This should
make for suitably low latencies for recording and monitoring MIDI to
soft synths.
There are other pros and cons. In low-latency mode, most of the audio
code gets the same (RT or whatever) priority as the RT thread, so it
may get CPU time more easily and so may perform better particularly
if your machine is short of CPU and/or memory and you run JACK in RT
mode. On the other hand, it risks Rosegarden getting kicked out of
JACK more easily if you get a bad plugin (or bad code in RG).
Buffered mode might work better than low-latency mode for plain
playback if you have plenty of CPU and memory and you don't generally
run JACK with RT priority or if you run Rosegarden as root.
The default is low-latency mode, because it has most of the advantages
above. Unfortunately we have no way to tell you if you're selecting
a non-RT-safe plugin, which makes this slightly risky at the moment.
As for the settings that were formerly under the Buffering tab:
they're now hard-coded with slightly different values depending on
whether you have buffered or low-latency mode. If you find the
current buffered mode doesn't work as well for you as your previous
optimal settings, I'd like to know about it.
Chris
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