FR: add ability to set a final output volume for every preset

  • In all HELIX hardware units - for every preset there is a CHANNEL VOLUME setting which determines the final signal level that will be output from the entire effect-chain.

    Please add the same facility in BIAS AMP and BIAS FX>

    This helps greatly with matching presets to be at the same volume levels. One of the problems for example with downloaded presets from the cloud is they all come at varying output levels. Level matching and balancing is required and having a means to easily and clearly determine the overall output volume for a patch ( in addition to having a global volume level as provided by the slider faders at the bottom )