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Is here any ... like lowpass filter , but for the MPX signal . SOmething like 64000 Hz lowpas . Last active signal is at 59 let`s say 60 Khz . SO 64000 is OK.
Or may be something like "Ignore freqs above" but for whole composite ? . This definitely will decrease the CPU load.
Let`s say Ignore above 64000 and slider to be upto 96000 ?Is it a good idea ?
What Bojcha means is in order to construct the analog 75Khz Mpx signal (analog wave form) you have to generate at least 2 samples (digital sample rate) and this is a rock minimum.
So minimal digital sample rate has to be 2 x 75 = 150Khz, but in real life this 150Khz is actualy to less, in order te have a reasonable MPX construction a minimum of 176.4 is advised.
at 192Khz sample rate you get a better and more detailed construction of the 75Khz Mpx signal.