This is just a minor detail.
The Mixer EQ has its Low Gain slider set to “bipolar.”
However, the mpReverb has its Low Gain slider set to “unipolar.” Perhaps it should be “bipolar” as well.
Surely that depends on the algorithm used in the reverb itself?
This depends on how the programmer determines the visual behavior of the slider bar, based on the associated quantity range. It’s simply a visual feature.
In this case, the negative and positive ranges coincide, so it seems most correct to configure it in “bipolar” (in the style of the panning silider; right, center, left).
In this specific parameter, there is no algorithm. They are simply mathematical conversions. An algorithm is something like a sequence of steps, but more complex. There’s nothing like that here.
Only a range of values is associated with a visual configuration.
This is actually a problem with external devices, such as VST instrument plugins, since no such association exists, at least not directly. All sliders are set to unipolar because they are not deterministic.
Gain really is never displayed as a bipolar parameter. It’s just a coincidence that the lower and upper values are -18 and 18 dB here. It actually makes more sense to use something like -60 to 18 dB.
Okay, so I must assume that the Low Gain or Mid Gain or Hi Gain of the Mixer EQ is bipolar because it seems more coherent to configure it that way according to the graph on the right.
Another observation. If you set the graph to -48 dB to 48 dB, and put Low Gain at -18 dB, the graph drops abruptly to -48 dB. Shouldn’t it stop at -18 dB?
I’m also noticing strange behavior with the curve when changing the dB values, both in Mid Gain and Hi Gain.
If the range starts at -18, the curve shouldn’t go beyond that, right?
Note: Shouldn’t these ranges all actually be from -60 to +18 dB? Let’s see if the curve is correct and it’s the dB value range that’s incomplete…