[fluid-dev] One output per channel

[Bernat Arlandis i Mañó]

What do you think about fixing ticket #21 for 1.09? Without this, 
multi-channel output cannot be enabled from QSynth.

Also, I've fixed the reverb and chorus effects in multichannel mode so 
they're applied to every channel, instead of mixing the effects separately.

I'm thinking about starting the new branch and commit these changes 
there so you can review them in case you consider merging them to the trunk.

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Bernat Arlandis i Mañó