WAV/OGG Export bugs - 1.0 and nightly

(I had post this as a reply to another report, but it grew up a little so I created a new post.)

The WAV / ogg / flac exporter is ignoring the Reverb and Volume settings on the synth and using the maximum levels, so exports are terribly loud and reverbered.

I am using the windows version 1.0 and the default TimGM6mb.sf2 soundfont. Also found these related small issues:

1. Reverb slider playback: When I open museScore, the reverb slider on the synth is reset at about 70%. (it is bad that it resets, for starters). But the real reverb I listen is that was set before closing last session. In other words, If I dry the reverb to zero and then restart musescore, i hear no reverb, even with the slider at 70% again. But if I slightly drag the reverb slider, the change takes effect.

2. Export to audio. It seems that the export uses the maximum values for reverb and volume, ignoring the Synth window settings. I just exported the composition with minimum Vol and Rev in the synth window, and the OGG or WAV file is extremely loud and echoed.

The only way to export a dry audio file is to turn down the Rev controls on the mixer. This is not a workaround but a confirmation of the bug - even when the 'effects' on the mixer are high, turning down the Rev knob of each channel prevents the effect to be applied.

3. As a related bug, when changing the soundfont file in the synth window, the Reverb of each instrument in the mixer is reset to zero on the playback. The knobs in the mixer remain the same, but no reverb is done. I have to slightly move the knobs so the reverb value has effect.