[LAD] Handling of expression controller in fluidsynth and linuxsampler

[Nikita Zlobin]

Trying to get live strings and vocal in linuxsampler, i was suprised by
fact, that this controller doesn't have effect (with all engines and
banks, including suggested for fluidsynth), but with fluidsynth all ok.

It is not clear now, how this controller should be handler at all. I
expected, that it should be same as for velocity, but set for enter
channel and variable, unlike V, specified for notes and constant).

I searched both in fluidsynth and qsynth sources to see, for handling
code, but found in fluidsynth only two constants (EXPRESSION_LSB and
EXPRESSION_MSB) and command, setting these parameters to default value
(127).

IMHO, it is very necessary for linuxsampler, and who knows, what is not
done for fluidsynth. Looks like LS devs left it for user (using
qmidiroute, mididings or sequencer's builtint converting capabilities
if available).

This link only confirms that:
http://bb.linuxsampler.org/viewtopic.php?f=6&t=207