> ...For now I'll treat the parameter as an opaque
> series of magic numbers.

The way the new beta NR works is:

Fx-y

x selects the length of the filter.

F1 = 121 taps, F2 = 91 taps, F3 = 61 taps, F4 = 31 taps

(The Beta 3.25 release used FIR filters of 61 taps.)

y selects values of Beta (gain), decay, and delay (how long the NR 
algorithm waits to process a signal)

(The Beta 3.5 release used the "x" parameter for these selections)

73,

Lyle KK7P

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