FX-Mixer channel routing

[Rogemcy]

Enhancement Summary

Some times need routing survial channels to a single channel, not ONLY FX but the global volume. For examples, decreasing the volume of all EGuitar channels at the same time or just mute them by one click.

Implementation Details / Mockup

Turning the "FX-Mixer" to "Mixer", each channel's volume range from -100 to 100, -100 means mute itself and all routing child channels, 0 means default volume , 100 means highest volume. As compensation, add a percentage knobs for every FX on the right side of each FX panel.

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