MFlanger: Range vs Delay

[anton_s]

The MFlangerMB manual describes the Range and Delay parameters rather vaguely:

Range
Range defines the size of the flanging frequency delay line.

Delay
Delay defines the delay applied to the flanging signal.

In an old post, Vojtech explained that

Anyway delay moves the entire signal in time by a constant value, while range defines the length of the moving tape delay and defines the amount of flanging. Delay can be used to remove collisions with the original signal or potentially for some creative stuff.

How are Range and Delay combined to calculate the minimum and maximum delay times? Is Delay the minimum delay, or the center of the oscillations? For example, if Delay = 10ms and Range = 10ms, does the flanging signal range between 5ms and 15ms, or between 10ms and 20ms?

[MeldaProduction]

Well, I think they add -> Delay + Range * oscillator in 0..1
I wonder, why? I mean, this is not exactly scientific plugin.